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Finding the Fourth Proportional to 390,941.73, 539,221.42 and 358,780.23

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Solution

The fourth proportional to 390,941.73, 539,221.42 and 358,780.23 is: 494,861.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,941.73 : 539,221.42 = 358,780.23 : x
  2. Step 2: Convert to fraction form
    390,941.73/539,221.42 = 358,780.23/x
  3. Step 3: Cross multiply
    390,941.73x = 539,221.42 × 358,780.23
  4. Step 4: Simplify right side
    390,941.73x = 193,461,984,191.58
  5. Step 5: Solve for x
    x = 193,461,984,191.58/390,941.73
  6. Step 6: Final answer
    x = 494,861.43

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.