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Finding the Fourth Proportional to 72,985.10, 109,480.89 and 28,607.90

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Solution

The fourth proportional to 72,985.10, 109,480.89 and 28,607.90 is: 42,913.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,985.10 : 109,480.89 = 28,607.90 : x
  2. Step 2: Convert to fraction form
    72,985.10/109,480.89 = 28,607.90/x
  3. Step 3: Cross multiply
    72,985.10x = 109,480.89 × 28,607.90
  4. Step 4: Simplify right side
    72,985.10x = 3,132,018,353.03
  5. Step 5: Solve for x
    x = 3,132,018,353.03/72,985.10
  6. Step 6: Final answer
    x = 42,913.12

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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.