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Finding the Fourth Proportional to 970.34, 1,336.15 and 869.20

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Solution

The fourth proportional to 970.34, 1,336.15 and 869.20 is: 1,196.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.34 : 1,336.15 = 869.20 : x
  2. Step 2: Convert to fraction form
    970.34/1,336.15 = 869.20/x
  3. Step 3: Cross multiply
    970.34x = 1,336.15 × 869.20
  4. Step 4: Simplify right side
    970.34x = 1,161,381.58
  5. Step 5: Solve for x
    x = 1,161,381.58/970.34
  6. Step 6: Final answer
    x = 1,196.88

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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.