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Finding the Fourth Proportional to 390,585.96, 539,066.10 and 247,359.36

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Solution

The fourth proportional to 390,585.96, 539,066.10 and 247,359.36 is: 341,392.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,585.96 : 539,066.10 = 247,359.36 : x
  2. Step 2: Convert to fraction form
    390,585.96/539,066.10 = 247,359.36/x
  3. Step 3: Cross multiply
    390,585.96x = 539,066.10 × 247,359.36
  4. Step 4: Simplify right side
    390,585.96x = 133,343,045,493.70
  5. Step 5: Solve for x
    x = 133,343,045,493.70/390,585.96
  6. Step 6: Final answer
    x = 341,392.32

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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.