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Finding the Fourth Proportional to 870.26, 1,305.40 and 696.70

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Solution

The fourth proportional to 870.26, 1,305.40 and 696.70 is: 1,045.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.26 : 1,305.40 = 696.70 : x
  2. Step 2: Convert to fraction form
    870.26/1,305.40 = 696.70/x
  3. Step 3: Cross multiply
    870.26x = 1,305.40 × 696.70
  4. Step 4: Simplify right side
    870.26x = 909,472.18
  5. Step 5: Solve for x
    x = 909,472.18/870.26
  6. Step 6: Final answer
    x = 1,045.06

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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.