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Finding the Fourth Proportional to 390,125.64, 538,417.17 and 220,370.70

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Solution

The fourth proportional to 390,125.64, 538,417.17 and 220,370.70 is: 304,136.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,125.64 : 538,417.17 = 220,370.70 : x
  2. Step 2: Convert to fraction form
    390,125.64/538,417.17 = 220,370.70/x
  3. Step 3: Cross multiply
    390,125.64x = 538,417.17 × 220,370.70
  4. Step 4: Simplify right side
    390,125.64x = 118,651,368,644.92
  5. Step 5: Solve for x
    x = 118,651,368,644.92/390,125.64
  6. Step 6: Final answer
    x = 304,136.30

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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.