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Finding the Fourth Proportional to 711.76, 981.60 and 545.68

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Solution

The fourth proportional to 711.76, 981.60 and 545.68 is: 752.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.76 : 981.60 = 545.68 : x
  2. Step 2: Convert to fraction form
    711.76/981.60 = 545.68/x
  3. Step 3: Cross multiply
    711.76x = 981.60 × 545.68
  4. Step 4: Simplify right side
    711.76x = 535,639.49
  5. Step 5: Solve for x
    x = 535,639.49/711.76
  6. Step 6: Final answer
    x = 752.56

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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.