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Finding the Fourth Proportional to 390,177.65, 538,488.86 and 220,422.71

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Solution

The fourth proportional to 390,177.65, 538,488.86 and 220,422.71 is: 304,208.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,177.65 : 538,488.86 = 220,422.71 : x
  2. Step 2: Convert to fraction form
    390,177.65/538,488.86 = 220,422.71/x
  3. Step 3: Cross multiply
    390,177.65x = 538,488.86 × 220,422.71
  4. Step 4: Simplify right side
    390,177.65x = 118,695,172,723.90
  5. Step 5: Solve for x
    x = 118,695,172,723.90/390,177.65
  6. Step 6: Final answer
    x = 304,208.03

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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.