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Finding the Fourth Proportional to 386,987.72, 580,461.08 and 120,717.72

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Solution

The fourth proportional to 386,987.72, 580,461.08 and 120,717.72 is: 181,070.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,987.72 : 580,461.08 = 120,717.72 : x
  2. Step 2: Convert to fraction form
    386,987.72/580,461.08 = 120,717.72/x
  3. Step 3: Cross multiply
    386,987.72x = 580,461.08 × 120,717.72
  4. Step 4: Simplify right side
    386,987.72x = 70,071,937,522.75
  5. Step 5: Solve for x
    x = 70,071,937,522.75/386,987.72
  6. Step 6: Final answer
    x = 181,070.19

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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.