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Finding the Fourth Proportional to 66,419.70, 99,629.55 and 42,800.10

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Solution

The fourth proportional to 66,419.70, 99,629.55 and 42,800.10 is: 64,200.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,419.70 : 99,629.55 = 42,800.10 : x
  2. Step 2: Convert to fraction form
    66,419.70/99,629.55 = 42,800.10/x
  3. Step 3: Cross multiply
    66,419.70x = 99,629.55 × 42,800.10
  4. Step 4: Simplify right side
    66,419.70x = 4,264,154,702.96
  5. Step 5: Solve for x
    x = 4,264,154,702.96/66,419.70
  6. Step 6: Final answer
    x = 64,200.15

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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.