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Finding the Fourth Proportional to 458,000.20, 687,000.30 and 121,040.20

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Solution

The fourth proportional to 458,000.20, 687,000.30 and 121,040.20 is: 181,560.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,000.20 : 687,000.30 = 121,040.20 : x
  2. Step 2: Convert to fraction form
    458,000.20/687,000.30 = 121,040.20/x
  3. Step 3: Cross multiply
    458,000.20x = 687,000.30 × 121,040.20
  4. Step 4: Simplify right side
    458,000.20x = 83,154,653,712.06
  5. Step 5: Solve for x
    x = 83,154,653,712.06/458,000.20
  6. Step 6: Final answer
    x = 181,560.30

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Similar ratio
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1.5x scale

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.