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Finding the Fourth Proportional to 643,031.28, 887,381.64 and 356,544

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Solution

The fourth proportional to 643,031.28, 887,381.64 and 356,544 is: 492,029.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,031.28 : 887,381.64 = 356,544 : x
  2. Step 2: Convert to fraction form
    643,031.28/887,381.64 = 356,544/x
  3. Step 3: Cross multiply
    643,031.28x = 887,381.64 × 356,544
  4. Step 4: Simplify right side
    643,031.28x = 316,390,599,452.16
  5. Step 5: Solve for x
    x = 316,390,599,452.16/643,031.28
  6. Step 6: Final answer
    x = 492,029.87

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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.