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Finding the Fourth Proportional to 66,539.80, 99,809.70 and 42,920.20

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Solution

The fourth proportional to 66,539.80, 99,809.70 and 42,920.20 is: 64,380.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,539.80 : 99,809.70 = 42,920.20 : x
  2. Step 2: Convert to fraction form
    66,539.80/99,809.70 = 42,920.20/x
  3. Step 3: Cross multiply
    66,539.80x = 99,809.70 × 42,920.20
  4. Step 4: Simplify right side
    66,539.80x = 4,283,852,285.94
  5. Step 5: Solve for x
    x = 4,283,852,285.94/66,539.80
  6. Step 6: Final answer
    x = 64,380.30

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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.