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Finding the Fourth Proportional to 870.56, 1,304.04 and 561.56

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Solution

The fourth proportional to 870.56, 1,304.04 and 561.56 is: 841.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.56 : 1,304.04 = 561.56 : x
  2. Step 2: Convert to fraction form
    870.56/1,304.04 = 561.56/x
  3. Step 3: Cross multiply
    870.56x = 1,304.04 × 561.56
  4. Step 4: Simplify right side
    870.56x = 732,296.70
  5. Step 5: Solve for x
    x = 732,296.70/870.56
  6. Step 6: Final answer
    x = 841.18

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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.