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Finding the Fourth Proportional to 66,420.80, 99,631.20 and 63,828.80

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Solution

The fourth proportional to 66,420.80, 99,631.20 and 63,828.80 is: 95,743.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,420.80 : 99,631.20 = 63,828.80 : x
  2. Step 2: Convert to fraction form
    66,420.80/99,631.20 = 63,828.80/x
  3. Step 3: Cross multiply
    66,420.80x = 99,631.20 × 63,828.80
  4. Step 4: Simplify right side
    66,420.80x = 6,359,339,938.56
  5. Step 5: Solve for x
    x = 6,359,339,938.56/66,420.80
  6. Step 6: Final answer
    x = 95,743.20

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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.