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Finding the Fourth Proportional to 643,320.68, 887,765.40 and 371,379.38

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Solution

The fourth proportional to 643,320.68, 887,765.40 and 371,379.38 is: 512,493.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,320.68 : 887,765.40 = 371,379.38 : x
  2. Step 2: Convert to fraction form
    643,320.68/887,765.40 = 371,379.38/x
  3. Step 3: Cross multiply
    643,320.68x = 887,765.40 × 371,379.38
  4. Step 4: Simplify right side
    643,320.68x = 329,697,759,398.63
  5. Step 5: Solve for x
    x = 329,697,759,398.63/643,320.68
  6. Step 6: Final answer
    x = 512,493.65

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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.