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Finding the Fourth Proportional to 970.55, 1,338.85 and 615.87

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Solution

The fourth proportional to 970.55, 1,338.85 and 615.87 is: 849.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.55 : 1,338.85 = 615.87 : x
  2. Step 2: Convert to fraction form
    970.55/1,338.85 = 615.87/x
  3. Step 3: Cross multiply
    970.55x = 1,338.85 × 615.87
  4. Step 4: Simplify right side
    970.55x = 824,557.55
  5. Step 5: Solve for x
    x = 824,557.55/970.55
  6. Step 6: Final answer
    x = 849.58

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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.