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Finding the Fourth Proportional to 72,671.34, 108,985.95 and 28,288.20

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Solution

The fourth proportional to 72,671.34, 108,985.95 and 28,288.20 is: 42,424.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,671.34 : 108,985.95 = 28,288.20 : x
  2. Step 2: Convert to fraction form
    72,671.34/108,985.95 = 28,288.20/x
  3. Step 3: Cross multiply
    72,671.34x = 108,985.95 × 28,288.20
  4. Step 4: Simplify right side
    72,671.34x = 3,083,016,350.79
  5. Step 5: Solve for x
    x = 3,083,016,350.79/72,671.34
  6. Step 6: Final answer
    x = 42,424.10

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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.