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Finding the Fourth Proportional to 66,543.80, 99,815.70 and 53,421.80

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Solution

The fourth proportional to 66,543.80, 99,815.70 and 53,421.80 is: 80,132.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,543.80 : 99,815.70 = 53,421.80 : x
  2. Step 2: Convert to fraction form
    66,543.80/99,815.70 = 53,421.80/x
  3. Step 3: Cross multiply
    66,543.80x = 99,815.70 × 53,421.80
  4. Step 4: Simplify right side
    66,543.80x = 5,332,334,362.26
  5. Step 5: Solve for x
    x = 5,332,334,362.26/66,543.80
  6. Step 6: Final answer
    x = 80,132.70

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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.