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Finding the Fourth Proportional to 65,999.70, 98,999.55 and 39,690.90

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Solution

The fourth proportional to 65,999.70, 98,999.55 and 39,690.90 is: 59,536.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,999.70 : 98,999.55 = 39,690.90 : x
  2. Step 2: Convert to fraction form
    65,999.70/98,999.55 = 39,690.90/x
  3. Step 3: Cross multiply
    65,999.70x = 98,999.55 × 39,690.90
  4. Step 4: Simplify right side
    65,999.70x = 3,929,381,239.10
  5. Step 5: Solve for x
    x = 3,929,381,239.10/65,999.70
  6. Step 6: Final answer
    x = 59,536.35

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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.