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Finding the Fourth Proportional to 65,720.90, 98,581.35 and 39,412.10

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Solution

The fourth proportional to 65,720.90, 98,581.35 and 39,412.10 is: 59,118.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,720.90 : 98,581.35 = 39,412.10 : x
  2. Step 2: Convert to fraction form
    65,720.90/98,581.35 = 39,412.10/x
  3. Step 3: Cross multiply
    65,720.90x = 98,581.35 × 39,412.10
  4. Step 4: Simplify right side
    65,720.90x = 3,885,298,024.34
  5. Step 5: Solve for x
    x = 3,885,298,024.34/65,720.90
  6. Step 6: Final answer
    x = 59,118.15

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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.