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Finding the Fourth Proportional to 885.32, 1,328.30 and 429

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Solution

The fourth proportional to 885.32, 1,328.30 and 429 is: 643.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.32 : 1,328.30 = 429 : x
  2. Step 2: Convert to fraction form
    885.32/1,328.30 = 429/x
  3. Step 3: Cross multiply
    885.32x = 1,328.30 × 429
  4. Step 4: Simplify right side
    885.32x = 569,840.70
  5. Step 5: Solve for x
    x = 569,840.70/885.32
  6. Step 6: Final answer
    x = 643.66

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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.