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Finding the Fourth Proportional to 981.80, 1,355.32 and 632.68

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Solution

The fourth proportional to 981.80, 1,355.32 and 632.68 is: 873.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.80 : 1,355.32 = 632.68 : x
  2. Step 2: Convert to fraction form
    981.80/1,355.32 = 632.68/x
  3. Step 3: Cross multiply
    981.80x = 1,355.32 × 632.68
  4. Step 4: Simplify right side
    981.80x = 857,483.86
  5. Step 5: Solve for x
    x = 857,483.86/981.80
  6. Step 6: Final answer
    x = 873.38

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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.