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Finding the Fourth Proportional to 85,412.02, 128,116.32 and 28,490.08

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Solution

The fourth proportional to 85,412.02, 128,116.32 and 28,490.08 is: 42,734.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,412.02 : 128,116.32 = 28,490.08 : x
  2. Step 2: Convert to fraction form
    85,412.02/128,116.32 = 28,490.08/x
  3. Step 3: Cross multiply
    85,412.02x = 128,116.32 × 28,490.08
  4. Step 4: Simplify right side
    85,412.02x = 3,650,044,206.11
  5. Step 5: Solve for x
    x = 3,650,044,206.11/85,412.02
  6. Step 6: Final answer
    x = 42,734.55

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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.