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Finding the Fourth Proportional to 390,358.08, 538,695.13 and 218,282.29

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Solution

The fourth proportional to 390,358.08, 538,695.13 and 218,282.29 is: 301,230.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,358.08 : 538,695.13 = 218,282.29 : x
  2. Step 2: Convert to fraction form
    390,358.08/538,695.13 = 218,282.29/x
  3. Step 3: Cross multiply
    390,358.08x = 538,695.13 × 218,282.29
  4. Step 4: Simplify right side
    390,358.08x = 117,587,604,695.80
  5. Step 5: Solve for x
    x = 117,587,604,695.80/390,358.08
  6. Step 6: Final answer
    x = 301,230.10

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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.