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Finding the Fourth Proportional to 390,934.40, 539,547.36 and 247,707.78

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Solution

The fourth proportional to 390,934.40, 539,547.36 and 247,707.78 is: 341,873.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,934.40 : 539,547.36 = 247,707.78 : x
  2. Step 2: Convert to fraction form
    390,934.40/539,547.36 = 247,707.78/x
  3. Step 3: Cross multiply
    390,934.40x = 539,547.36 × 247,707.78
  4. Step 4: Simplify right side
    390,934.40x = 133,650,078,750.46
  5. Step 5: Solve for x
    x = 133,650,078,750.46/390,934.40
  6. Step 6: Final answer
    x = 341,873.42

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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.