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Finding the Fourth Proportional to 390,929.40, 539,540.46 and 247,702.77

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Solution

The fourth proportional to 390,929.40, 539,540.46 and 247,702.77 is: 341,866.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,929.40 : 539,540.46 = 247,702.77 : x
  2. Step 2: Convert to fraction form
    390,929.40/539,540.46 = 247,702.77/x
  3. Step 3: Cross multiply
    390,929.40x = 539,540.46 × 247,702.77
  4. Step 4: Simplify right side
    390,929.40x = 133,645,666,469.07
  5. Step 5: Solve for x
    x = 133,645,666,469.07/390,929.40
  6. Step 6: Final answer
    x = 341,866.50

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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.