Home / 715,253.42-987,056.40-392,970.20

Finding the Fourth Proportional to 715,253.42, 987,056.40 and 392,970.20

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Solution

The fourth proportional to 715,253.42, 987,056.40 and 392,970.20 is: 542,302.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,253.42 : 987,056.40 = 392,970.20 : x
  2. Step 2: Convert to fraction form
    715,253.42/987,056.40 = 392,970.20/x
  3. Step 3: Cross multiply
    715,253.42x = 987,056.40 × 392,970.20
  4. Step 4: Simplify right side
    715,253.42x = 387,883,750,919.28
  5. Step 5: Solve for x
    x = 387,883,750,919.28/715,253.42
  6. Step 6: Final answer
    x = 542,302.55

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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.