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Finding the Fourth Proportional to 959.04, 1,313.28 and 931.20

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Solution

The fourth proportional to 959.04, 1,313.28 and 931.20 is: 1,275.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.04 : 1,313.28 = 931.20 : x
  2. Step 2: Convert to fraction form
    959.04/1,313.28 = 931.20/x
  3. Step 3: Cross multiply
    959.04x = 1,313.28 × 931.20
  4. Step 4: Simplify right side
    959.04x = 1,222,926.34
  5. Step 5: Solve for x
    x = 1,222,926.34/959.04
  6. Step 6: Final answer
    x = 1,275.16

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.