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Finding the Fourth Proportional to 737.28, 1,011.84 and 678.40

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Solution

The fourth proportional to 737.28, 1,011.84 and 678.40 is: 931.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    737.28 : 1,011.84 = 678.40 : x
  2. Step 2: Convert to fraction form
    737.28/1,011.84 = 678.40/x
  3. Step 3: Cross multiply
    737.28x = 1,011.84 × 678.40
  4. Step 4: Simplify right side
    737.28x = 686,432.26
  5. Step 5: Solve for x
    x = 686,432.26/737.28
  6. Step 6: Final answer
    x = 931.03

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.