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Finding the Fourth Proportional to 129,492.58, 178,699.74 and 75,787.84

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Solution

The fourth proportional to 129,492.58, 178,699.74 and 75,787.84 is: 104,587.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,492.58 : 178,699.74 = 75,787.84 : x
  2. Step 2: Convert to fraction form
    129,492.58/178,699.74 = 75,787.84/x
  3. Step 3: Cross multiply
    129,492.58x = 178,699.74 × 75,787.84
  4. Step 4: Simplify right side
    129,492.58x = 13,543,267,303.16
  5. Step 5: Solve for x
    x = 13,543,267,303.16/129,492.58
  6. Step 6: Final answer
    x = 104,587.21

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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.