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Finding the Fourth Proportional to 390,531.70, 585,797.55 and 141,155.38

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Solution

The fourth proportional to 390,531.70, 585,797.55 and 141,155.38 is: 211,733.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,531.70 : 585,797.55 = 141,155.38 : x
  2. Step 2: Convert to fraction form
    390,531.70/585,797.55 = 141,155.38/x
  3. Step 3: Cross multiply
    390,531.70x = 585,797.55 × 141,155.38
  4. Step 4: Simplify right side
    390,531.70x = 82,688,475,773.32
  5. Step 5: Solve for x
    x = 82,688,475,773.32/390,531.70
  6. Step 6: Final answer
    x = 211,733.07

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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.