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Finding the Fourth Proportional to 715,920.55, 987,951.40 and 389,223.25

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Solution

The fourth proportional to 715,920.55, 987,951.40 and 389,223.25 is: 537,117.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,920.55 : 987,951.40 = 389,223.25 : x
  2. Step 2: Convert to fraction form
    715,920.55/987,951.40 = 389,223.25/x
  3. Step 3: Cross multiply
    715,920.55x = 987,951.40 × 389,223.25
  4. Step 4: Simplify right side
    715,920.55x = 384,533,654,750.05
  5. Step 5: Solve for x
    x = 384,533,654,750.05/715,920.55
  6. Step 6: Final answer
    x = 537,117.78

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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.