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Finding the Fourth Proportional to 438,638.72, 658,158.40 and 238,659.20

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Solution

The fourth proportional to 438,638.72, 658,158.40 and 238,659.20 is: 358,097.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,638.72 : 658,158.40 = 238,659.20 : x
  2. Step 2: Convert to fraction form
    438,638.72/658,158.40 = 238,659.20/x
  3. Step 3: Cross multiply
    438,638.72x = 658,158.40 × 238,659.20
  4. Step 4: Simplify right side
    438,638.72x = 157,075,557,217.28
  5. Step 5: Solve for x
    x = 157,075,557,217.28/438,638.72
  6. Step 6: Final answer
    x = 358,097.79

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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.