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Finding the Fourth Proportional to 870.69, 1,303.61 and 724.89

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Solution

The fourth proportional to 870.69, 1,303.61 and 724.89 is: 1,085.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.69 : 1,303.61 = 724.89 : x
  2. Step 2: Convert to fraction form
    870.69/1,303.61 = 724.89/x
  3. Step 3: Cross multiply
    870.69x = 1,303.61 × 724.89
  4. Step 4: Simplify right side
    870.69x = 944,970.23
  5. Step 5: Solve for x
    x = 944,970.23/870.69
  6. Step 6: Final answer
    x = 1,085.31

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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.