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Finding the Fourth Proportional to 390,813.26, 586,290.09 and 138,240.14

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Solution

The fourth proportional to 390,813.26, 586,290.09 and 138,240.14 is: 207,385.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,813.26 : 586,290.09 = 138,240.14 : x
  2. Step 2: Convert to fraction form
    390,813.26/586,290.09 = 138,240.14/x
  3. Step 3: Cross multiply
    390,813.26x = 586,290.09 × 138,240.14
  4. Step 4: Simplify right side
    390,813.26x = 81,048,824,122.21
  5. Step 5: Solve for x
    x = 81,048,824,122.21/390,813.26
  6. Step 6: Final answer
    x = 207,385.04

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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.