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Finding the Fourth Proportional to 1,139.86, 1,573.00 and 615.89

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Solution

The fourth proportional to 1,139.86, 1,573.00 and 615.89 is: 849.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.86 : 1,573.00 = 615.89 : x
  2. Step 2: Convert to fraction form
    1,139.86/1,573.00 = 615.89/x
  3. Step 3: Cross multiply
    1,139.86x = 1,573.00 × 615.89
  4. Step 4: Simplify right side
    1,139.86x = 968,789.38
  5. Step 5: Solve for x
    x = 968,789.38/1,139.86
  6. Step 6: Final answer
    x = 849.92

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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.