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Finding the Fourth Proportional to 870.15, 1,303.56 and 753.38

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Solution

The fourth proportional to 870.15, 1,303.56 and 753.38 is: 1,128.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.15 : 1,303.56 = 753.38 : x
  2. Step 2: Convert to fraction form
    870.15/1,303.56 = 753.38/x
  3. Step 3: Cross multiply
    870.15x = 1,303.56 × 753.38
  4. Step 4: Simplify right side
    870.15x = 982,069.52
  5. Step 5: Solve for x
    x = 982,069.52/870.15
  6. Step 6: Final answer
    x = 1,128.62

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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.