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Finding the Fourth Proportional to 663,031.81, 914,987.55 and 387,405.82

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Solution

The fourth proportional to 663,031.81, 914,987.55 and 387,405.82 is: 534,622.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,031.81 : 914,987.55 = 387,405.82 : x
  2. Step 2: Convert to fraction form
    663,031.81/914,987.55 = 387,405.82/x
  3. Step 3: Cross multiply
    663,031.81x = 914,987.55 × 387,405.82
  4. Step 4: Simplify right side
    663,031.81x = 354,471,502,097.54
  5. Step 5: Solve for x
    x = 354,471,502,097.54/663,031.81
  6. Step 6: Final answer
    x = 534,622.17

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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.