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Finding the Fourth Proportional to 129,770.16, 179,083.32 and 72,411.90

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Solution

The fourth proportional to 129,770.16, 179,083.32 and 72,411.90 is: 99,928.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,770.16 : 179,083.32 = 72,411.90 : x
  2. Step 2: Convert to fraction form
    129,770.16/179,083.32 = 72,411.90/x
  3. Step 3: Cross multiply
    129,770.16x = 179,083.32 × 72,411.90
  4. Step 4: Simplify right side
    129,770.16x = 12,967,763,459.51
  5. Step 5: Solve for x
    x = 12,967,763,459.51/129,770.16
  6. Step 6: Final answer
    x = 99,928.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.