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Finding the Fourth Proportional to 1,392.88, 2,088.76 and 571.56

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Solution

The fourth proportional to 1,392.88, 2,088.76 and 571.56 is: 857.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.88 : 2,088.76 = 571.56 : x
  2. Step 2: Convert to fraction form
    1,392.88/2,088.76 = 571.56/x
  3. Step 3: Cross multiply
    1,392.88x = 2,088.76 × 571.56
  4. Step 4: Simplify right side
    1,392.88x = 1,193,851.67
  5. Step 5: Solve for x
    x = 1,193,851.67/1,392.88
  6. Step 6: Final answer
    x = 857.11

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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.