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Finding the Fourth Proportional to 1,089.04, 1,631.30 and 722.66

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Solution

The fourth proportional to 1,089.04, 1,631.30 and 722.66 is: 1,082.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.04 : 1,631.30 = 722.66 : x
  2. Step 2: Convert to fraction form
    1,089.04/1,631.30 = 722.66/x
  3. Step 3: Cross multiply
    1,089.04x = 1,631.30 × 722.66
  4. Step 4: Simplify right side
    1,089.04x = 1,178,875.26
  5. Step 5: Solve for x
    x = 1,178,875.26/1,089.04
  6. Step 6: Final answer
    x = 1,082.49

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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.