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Finding the Fourth Proportional to 1,108.40, 1,530.36 and 688.92

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Solution

The fourth proportional to 1,108.40, 1,530.36 and 688.92 is: 951.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.40 : 1,530.36 = 688.92 : x
  2. Step 2: Convert to fraction form
    1,108.40/1,530.36 = 688.92/x
  3. Step 3: Cross multiply
    1,108.40x = 1,530.36 × 688.92
  4. Step 4: Simplify right side
    1,108.40x = 1,054,289.87
  5. Step 5: Solve for x
    x = 1,054,289.87/1,108.40
  6. Step 6: Final answer
    x = 951.19

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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.