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Finding the Fourth Proportional to 885,489.80, 1,328,061.90 and 286,305.80

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Solution

The fourth proportional to 885,489.80, 1,328,061.90 and 286,305.80 is: 429,402.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    885,489.80 : 1,328,061.90 = 286,305.80 : x
  2. Step 2: Convert to fraction form
    885,489.80/1,328,061.90 = 286,305.80/x
  3. Step 3: Cross multiply
    885,489.80x = 1,328,061.90 × 286,305.80
  4. Step 4: Simplify right side
    885,489.80x = 380,231,824,729.02
  5. Step 5: Solve for x
    x = 380,231,824,729.02/885,489.80
  6. Step 6: Final answer
    x = 429,402.83

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.