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Finding the Fourth Proportional to 900.99, 1,239.76 and 691.08

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Solution

The fourth proportional to 900.99, 1,239.76 and 691.08 is: 950.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.99 : 1,239.76 = 691.08 : x
  2. Step 2: Convert to fraction form
    900.99/1,239.76 = 691.08/x
  3. Step 3: Cross multiply
    900.99x = 1,239.76 × 691.08
  4. Step 4: Simplify right side
    900.99x = 856,772.64
  5. Step 5: Solve for x
    x = 856,772.64/900.99
  6. Step 6: Final answer
    x = 950.92

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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.