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Finding the Fourth Proportional to 900.03, 1,243.18 and 688.92

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Solution

The fourth proportional to 900.03, 1,243.18 and 688.92 is: 951.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.03 : 1,243.18 = 688.92 : x
  2. Step 2: Convert to fraction form
    900.03/1,243.18 = 688.92/x
  3. Step 3: Cross multiply
    900.03x = 1,243.18 × 688.92
  4. Step 4: Simplify right side
    900.03x = 856,451.57
  5. Step 5: Solve for x
    x = 856,451.57/900.03
  6. Step 6: Final answer
    x = 951.58

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1.5x scale

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.