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Finding the Fourth Proportional to 386,988.80, 580,588.40 and 162,231.20

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Solution

The fourth proportional to 386,988.80, 580,588.40 and 162,231.20 is: 243,390.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,988.80 : 580,588.40 = 162,231.20 : x
  2. Step 2: Convert to fraction form
    386,988.80/580,588.40 = 162,231.20/x
  3. Step 3: Cross multiply
    386,988.80x = 580,588.40 × 162,231.20
  4. Step 4: Simplify right side
    386,988.80x = 94,189,552,838.08
  5. Step 5: Solve for x
    x = 94,189,552,838.08/386,988.80
  6. Step 6: Final answer
    x = 243,390.90

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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.