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Finding the Fourth Proportional to 643,967.61, 888,630.78 and 357,465.15

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Solution

The fourth proportional to 643,967.61, 888,630.78 and 357,465.15 is: 493,277.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,967.61 : 888,630.78 = 357,465.15 : x
  2. Step 2: Convert to fraction form
    643,967.61/888,630.78 = 357,465.15/x
  3. Step 3: Cross multiply
    643,967.61x = 888,630.78 × 357,465.15
  4. Step 4: Simplify right side
    643,967.61x = 317,654,535,067.32
  5. Step 5: Solve for x
    x = 317,654,535,067.32/643,967.61
  6. Step 6: Final answer
    x = 493,277.19

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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.