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Finding the Fourth Proportional to 643,437.76, 887,945.12 and 356,957.84

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Solution

The fourth proportional to 643,437.76, 887,945.12 and 356,957.84 is: 492,602.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,437.76 : 887,945.12 = 356,957.84 : x
  2. Step 2: Convert to fraction form
    643,437.76/887,945.12 = 356,957.84/x
  3. Step 3: Cross multiply
    643,437.76x = 887,945.12 × 356,957.84
  4. Step 4: Simplify right side
    643,437.76x = 316,958,972,073.74
  5. Step 5: Solve for x
    x = 316,958,972,073.74/643,437.76
  6. Step 6: Final answer
    x = 492,602.38

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Double scale
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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.