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Finding the Fourth Proportional to 390,912.10, 586,805.55 and 302,557.30

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Solution

The fourth proportional to 390,912.10, 586,805.55 and 302,557.30 is: 454,174.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,912.10 : 586,805.55 = 302,557.30 : x
  2. Step 2: Convert to fraction form
    390,912.10/586,805.55 = 302,557.30/x
  3. Step 3: Cross multiply
    390,912.10x = 586,805.55 × 302,557.30
  4. Step 4: Simplify right side
    390,912.10x = 177,542,302,833.02
  5. Step 5: Solve for x
    x = 177,542,302,833.02/390,912.10
  6. Step 6: Final answer
    x = 454,174.49

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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.