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Finding the Fourth Proportional to 870.56, 1,306.42 and 578.40

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Solution

The fourth proportional to 870.56, 1,306.42 and 578.40 is: 867.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.56 : 1,306.42 = 578.40 : x
  2. Step 2: Convert to fraction form
    870.56/1,306.42 = 578.40/x
  3. Step 3: Cross multiply
    870.56x = 1,306.42 × 578.40
  4. Step 4: Simplify right side
    870.56x = 755,633.33
  5. Step 5: Solve for x
    x = 755,633.33/870.56
  6. Step 6: Final answer
    x = 867.99

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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.