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Finding the Fourth Proportional to 423,065.20, 634,535.49 and 138,785.79

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Solution

The fourth proportional to 423,065.20, 634,535.49 and 138,785.79 is: 208,158.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    423,065.20 : 634,535.49 = 138,785.79 : x
  2. Step 2: Convert to fraction form
    423,065.20/634,535.49 = 138,785.79/x
  3. Step 3: Cross multiply
    423,065.20x = 634,535.49 × 138,785.79
  4. Step 4: Simplify right side
    423,065.20x = 88,064,509,262.69
  5. Step 5: Solve for x
    x = 88,064,509,262.69/423,065.20
  6. Step 6: Final answer
    x = 208,158.24

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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.