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Finding the Fourth Proportional to 129,065.68, 178,111.74 and 72,482.32

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Solution

The fourth proportional to 129,065.68, 178,111.74 and 72,482.32 is: 100,026.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,065.68 : 178,111.74 = 72,482.32 : x
  2. Step 2: Convert to fraction form
    129,065.68/178,111.74 = 72,482.32/x
  3. Step 3: Cross multiply
    129,065.68x = 178,111.74 × 72,482.32
  4. Step 4: Simplify right side
    129,065.68x = 12,909,952,134.44
  5. Step 5: Solve for x
    x = 12,909,952,134.44/129,065.68
  6. Step 6: Final answer
    x = 100,026.22

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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.