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Finding the Fourth Proportional to 970.38, 1,338.60 and 615.66

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Solution

The fourth proportional to 970.38, 1,338.60 and 615.66 is: 849.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.38 : 1,338.60 = 615.66 : x
  2. Step 2: Convert to fraction form
    970.38/1,338.60 = 615.66/x
  3. Step 3: Cross multiply
    970.38x = 1,338.60 × 615.66
  4. Step 4: Simplify right side
    970.38x = 824,122.48
  5. Step 5: Solve for x
    x = 824,122.48/970.38
  6. Step 6: Final answer
    x = 849.28

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1.5x scale

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.