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Finding the Fourth Proportional to 1,360.64, 2,042.88 and 1,040

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Solution

The fourth proportional to 1,360.64, 2,042.88 and 1,040 is: 1,561.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,360.64 : 2,042.88 = 1,040 : x
  2. Step 2: Convert to fraction form
    1,360.64/2,042.88 = 1,040/x
  3. Step 3: Cross multiply
    1,360.64x = 2,042.88 × 1,040
  4. Step 4: Simplify right side
    1,360.64x = 2,124,595.20
  5. Step 5: Solve for x
    x = 2,124,595.20/1,360.64
  6. Step 6: Final answer
    x = 1,561.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.