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Finding the Fourth Proportional to 287,541.20, 431,311.80 and 77,200.40

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Solution

The fourth proportional to 287,541.20, 431,311.80 and 77,200.40 is: 115,800.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,541.20 : 431,311.80 = 77,200.40 : x
  2. Step 2: Convert to fraction form
    287,541.20/431,311.80 = 77,200.40/x
  3. Step 3: Cross multiply
    287,541.20x = 431,311.80 × 77,200.40
  4. Step 4: Simplify right side
    287,541.20x = 33,297,443,484.72
  5. Step 5: Solve for x
    x = 33,297,443,484.72/287,541.20
  6. Step 6: Final answer
    x = 115,800.60

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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.