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Finding the Fourth Proportional to 66,428.68, 99,642.68 and 28,472.40

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Solution

The fourth proportional to 66,428.68, 99,642.68 and 28,472.40 is: 42,708.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,428.68 : 99,642.68 = 28,472.40 : x
  2. Step 2: Convert to fraction form
    66,428.68/99,642.68 = 28,472.40/x
  3. Step 3: Cross multiply
    66,428.68x = 99,642.68 × 28,472.40
  4. Step 4: Simplify right side
    66,428.68x = 2,837,066,242.03
  5. Step 5: Solve for x
    x = 2,837,066,242.03/66,428.68
  6. Step 6: Final answer
    x = 42,708.45

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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.