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Finding the Fourth Proportional to 716,278.40, 988,443.54 and 393,988.48

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Solution

The fourth proportional to 716,278.40, 988,443.54 and 393,988.48 is: 543,692.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,278.40 : 988,443.54 = 393,988.48 : x
  2. Step 2: Convert to fraction form
    716,278.40/988,443.54 = 393,988.48/x
  3. Step 3: Cross multiply
    716,278.40x = 988,443.54 × 393,988.48
  4. Step 4: Simplify right side
    716,278.40x = 389,435,367,890.42
  5. Step 5: Solve for x
    x = 389,435,367,890.42/716,278.40
  6. Step 6: Final answer
    x = 543,692.74

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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.