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Finding the Fourth Proportional to 1,139.42, 1,572.40 and 615.45

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Solution

The fourth proportional to 1,139.42, 1,572.40 and 615.45 is: 849.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.42 : 1,572.40 = 615.45 : x
  2. Step 2: Convert to fraction form
    1,139.42/1,572.40 = 615.45/x
  3. Step 3: Cross multiply
    1,139.42x = 1,572.40 × 615.45
  4. Step 4: Simplify right side
    1,139.42x = 967,741.78
  5. Step 5: Solve for x
    x = 967,741.78/1,139.42
  6. Step 6: Final answer
    x = 849.33

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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.