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Finding the Fourth Proportional to 390,486, 585,669.82 and 134,357.52

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Solution

The fourth proportional to 390,486, 585,669.82 and 134,357.52 is: 201,515.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,486 : 585,669.82 = 134,357.52 : x
  2. Step 2: Convert to fraction form
    390,486/585,669.82 = 134,357.52/x
  3. Step 3: Cross multiply
    390,486x = 585,669.82 × 134,357.52
  4. Step 4: Simplify right side
    390,486x = 78,689,143,882.26
  5. Step 5: Solve for x
    x = 78,689,143,882.26/390,486
  6. Step 6: Final answer
    x = 201,515.92

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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.