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Finding the Fourth Proportional to 643,643.52, 888,156 and 357,175.68

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Solution

The fourth proportional to 643,643.52, 888,156 and 357,175.68 is: 492,862.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,643.52 : 888,156 = 357,175.68 : x
  2. Step 2: Convert to fraction form
    643,643.52/888,156 = 357,175.68/x
  3. Step 3: Cross multiply
    643,643.52x = 888,156 × 357,175.68
  4. Step 4: Simplify right side
    643,643.52x = 317,227,723,246.08
  5. Step 5: Solve for x
    x = 317,227,723,246.08/643,643.52
  6. Step 6: Final answer
    x = 492,862.45

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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.