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Finding the Fourth Proportional to 658,912.10, 988,368.15 and 392,972.90

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Solution

The fourth proportional to 658,912.10, 988,368.15 and 392,972.90 is: 589,459.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    658,912.10 : 988,368.15 = 392,972.90 : x
  2. Step 2: Convert to fraction form
    658,912.10/988,368.15 = 392,972.90/x
  3. Step 3: Cross multiply
    658,912.10x = 988,368.15 × 392,972.90
  4. Step 4: Simplify right side
    658,912.10x = 388,401,898,173.14
  5. Step 5: Solve for x
    x = 388,401,898,173.14/658,912.10
  6. Step 6: Final answer
    x = 589,459.35

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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.