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Finding the Fourth Proportional to 716,274.95, 988,443.18 and 393,978.12

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Solution

The fourth proportional to 716,274.95, 988,443.18 and 393,978.12 is: 543,680.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,274.95 : 988,443.18 = 393,978.12 : x
  2. Step 2: Convert to fraction form
    716,274.95/988,443.18 = 393,978.12/x
  3. Step 3: Cross multiply
    716,274.95x = 988,443.18 × 393,978.12
  4. Step 4: Simplify right side
    716,274.95x = 389,424,985,783.22
  5. Step 5: Solve for x
    x = 389,424,985,783.22/716,274.95
  6. Step 6: Final answer
    x = 543,680.87

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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.