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Finding the Fourth Proportional to 875.48, 1,310.88 and 771.70

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Solution

The fourth proportional to 875.48, 1,310.88 and 771.70 is: 1,155.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.48 : 1,310.88 = 771.70 : x
  2. Step 2: Convert to fraction form
    875.48/1,310.88 = 771.70/x
  3. Step 3: Cross multiply
    875.48x = 1,310.88 × 771.70
  4. Step 4: Simplify right side
    875.48x = 1,011,606.10
  5. Step 5: Solve for x
    x = 1,011,606.10/875.48
  6. Step 6: Final answer
    x = 1,155.49

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.