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Finding the Fourth Proportional to 390,356.08, 538,691.52 and 211,508.08

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Solution

The fourth proportional to 390,356.08, 538,691.52 and 211,508.08 is: 291,881.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,356.08 : 538,691.52 = 211,508.08 : x
  2. Step 2: Convert to fraction form
    390,356.08/538,691.52 = 211,508.08/x
  3. Step 3: Cross multiply
    390,356.08x = 538,691.52 × 211,508.08
  4. Step 4: Simplify right side
    390,356.08x = 113,937,609,107.48
  5. Step 5: Solve for x
    x = 113,937,609,107.48/390,356.08
  6. Step 6: Final answer
    x = 291,881.22

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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.