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Finding the Fourth Proportional to 1,098.60, 1,515.34 and 740.28

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Solution

The fourth proportional to 1,098.60, 1,515.34 and 740.28 is: 1,021.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,098.60 : 1,515.34 = 740.28 : x
  2. Step 2: Convert to fraction form
    1,098.60/1,515.34 = 740.28/x
  3. Step 3: Cross multiply
    1,098.60x = 1,515.34 × 740.28
  4. Step 4: Simplify right side
    1,098.60x = 1,121,775.90
  5. Step 5: Solve for x
    x = 1,121,775.90/1,098.60
  6. Step 6: Final answer
    x = 1,021.10

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.