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Finding the Fourth Proportional to 870.76, 1,306.94 and 545.16

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Solution

The fourth proportional to 870.76, 1,306.94 and 545.16 is: 818.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.76 : 1,306.94 = 545.16 : x
  2. Step 2: Convert to fraction form
    870.76/1,306.94 = 545.16/x
  3. Step 3: Cross multiply
    870.76x = 1,306.94 × 545.16
  4. Step 4: Simplify right side
    870.76x = 712,491.41
  5. Step 5: Solve for x
    x = 712,491.41/870.76
  6. Step 6: Final answer
    x = 818.24

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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.