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Finding the Fourth Proportional to 398,646.28, 550,136.20 and 217,356.76

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Solution

The fourth proportional to 398,646.28, 550,136.20 and 217,356.76 is: 299,954.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,646.28 : 550,136.20 = 217,356.76 : x
  2. Step 2: Convert to fraction form
    398,646.28/550,136.20 = 217,356.76/x
  3. Step 3: Cross multiply
    398,646.28x = 550,136.20 × 217,356.76
  4. Step 4: Simplify right side
    398,646.28x = 119,575,821,990.71
  5. Step 5: Solve for x
    x = 119,575,821,990.71/398,646.28
  6. Step 6: Final answer
    x = 299,954.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.