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Finding the Fourth Proportional to 66,085.80, 98,999.10 and 39,712.20

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Solution

The fourth proportional to 66,085.80, 98,999.10 and 39,712.20 is: 59,490.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,085.80 : 98,999.10 = 39,712.20 : x
  2. Step 2: Convert to fraction form
    66,085.80/98,999.10 = 39,712.20/x
  3. Step 3: Cross multiply
    66,085.80x = 98,999.10 × 39,712.20
  4. Step 4: Simplify right side
    66,085.80x = 3,931,472,059.02
  5. Step 5: Solve for x
    x = 3,931,472,059.02/66,085.80
  6. Step 6: Final answer
    x = 59,490.42

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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.