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Finding the Fourth Proportional to 390,961.90, 586,453.80 and 138,206.68

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Solution

The fourth proportional to 390,961.90, 586,453.80 and 138,206.68 is: 207,313.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,961.90 : 586,453.80 = 138,206.68 : x
  2. Step 2: Convert to fraction form
    390,961.90/586,453.80 = 138,206.68/x
  3. Step 3: Cross multiply
    390,961.90x = 586,453.80 × 138,206.68
  4. Step 4: Simplify right side
    390,961.90x = 81,051,832,671.38
  5. Step 5: Solve for x
    x = 81,051,832,671.38/390,961.90
  6. Step 6: Final answer
    x = 207,313.89

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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.