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Finding the Fourth Proportional to 553,432.80, 830,149.20 and 287,712.30

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Solution

The fourth proportional to 553,432.80, 830,149.20 and 287,712.30 is: 431,568.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    553,432.80 : 830,149.20 = 287,712.30 : x
  2. Step 2: Convert to fraction form
    553,432.80/830,149.20 = 287,712.30/x
  3. Step 3: Cross multiply
    553,432.80x = 830,149.20 × 287,712.30
  4. Step 4: Simplify right side
    553,432.80x = 238,844,135,675.16
  5. Step 5: Solve for x
    x = 238,844,135,675.16/553,432.80
  6. Step 6: Final answer
    x = 431,568.45

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.