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Finding the Fourth Proportional to 458,307.01, 687,486.78 and 121,338.90

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Solution

The fourth proportional to 458,307.01, 687,486.78 and 121,338.90 is: 182,015.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,307.01 : 687,486.78 = 121,338.90 : x
  2. Step 2: Convert to fraction form
    458,307.01/687,486.78 = 121,338.90/x
  3. Step 3: Cross multiply
    458,307.01x = 687,486.78 × 121,338.90
  4. Step 4: Simplify right side
    458,307.01x = 83,418,890,660.77
  5. Step 5: Solve for x
    x = 83,418,890,660.77/458,307.01
  6. Step 6: Final answer
    x = 182,015.31

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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.