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Finding the Fourth Proportional to 40,691, 61,037.58 and 12,989

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Solution

The fourth proportional to 40,691, 61,037.58 and 12,989 is: 19,483.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,691 : 61,037.58 = 12,989 : x
  2. Step 2: Convert to fraction form
    40,691/61,037.58 = 12,989/x
  3. Step 3: Cross multiply
    40,691x = 61,037.58 × 12,989
  4. Step 4: Simplify right side
    40,691x = 792,817,126.62
  5. Step 5: Solve for x
    x = 792,817,126.62/40,691
  6. Step 6: Final answer
    x = 19,483.84

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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.