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Finding the Fourth Proportional to 1,547.52, 2,321.80 and 681.88

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Solution

The fourth proportional to 1,547.52, 2,321.80 and 681.88 is: 1,023.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,547.52 : 2,321.80 = 681.88 : x
  2. Step 2: Convert to fraction form
    1,547.52/2,321.80 = 681.88/x
  3. Step 3: Cross multiply
    1,547.52x = 2,321.80 × 681.88
  4. Step 4: Simplify right side
    1,547.52x = 1,583,188.98
  5. Step 5: Solve for x
    x = 1,583,188.98/1,547.52
  6. Step 6: Final answer
    x = 1,023.05

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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.