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Finding the Fourth Proportional to 1,326.12, 1,988.50 and 709.72

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Solution

The fourth proportional to 1,326.12, 1,988.50 and 709.72 is: 1,064.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326.12 : 1,988.50 = 709.72 : x
  2. Step 2: Convert to fraction form
    1,326.12/1,988.50 = 709.72/x
  3. Step 3: Cross multiply
    1,326.12x = 1,988.50 × 709.72
  4. Step 4: Simplify right side
    1,326.12x = 1,411,278.22
  5. Step 5: Solve for x
    x = 1,411,278.22/1,326.12
  6. Step 6: Final answer
    x = 1,064.22

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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.