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Finding the Fourth Proportional to 1,225.76, 1,689.98 and 782.92

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Solution

The fourth proportional to 1,225.76, 1,689.98 and 782.92 is: 1,079.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,225.76 : 1,689.98 = 782.92 : x
  2. Step 2: Convert to fraction form
    1,225.76/1,689.98 = 782.92/x
  3. Step 3: Cross multiply
    1,225.76x = 1,689.98 × 782.92
  4. Step 4: Simplify right side
    1,225.76x = 1,323,119.14
  5. Step 5: Solve for x
    x = 1,323,119.14/1,225.76
  6. Step 6: Final answer
    x = 1,079.43

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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.