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Finding the Fourth Proportional to 870.32, 1,201.10 and 571.76

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Solution

The fourth proportional to 870.32, 1,201.10 and 571.76 is: 789.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.32 : 1,201.10 = 571.76 : x
  2. Step 2: Convert to fraction form
    870.32/1,201.10 = 571.76/x
  3. Step 3: Cross multiply
    870.32x = 1,201.10 × 571.76
  4. Step 4: Simplify right side
    870.32x = 686,740.94
  5. Step 5: Solve for x
    x = 686,740.94/870.32
  6. Step 6: Final answer
    x = 789.07

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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.