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Finding the Fourth Proportional to 900.16, 1,242.80 and 679.52

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Solution

The fourth proportional to 900.16, 1,242.80 and 679.52 is: 938.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.16 : 1,242.80 = 679.52 : x
  2. Step 2: Convert to fraction form
    900.16/1,242.80 = 679.52/x
  3. Step 3: Cross multiply
    900.16x = 1,242.80 × 679.52
  4. Step 4: Simplify right side
    900.16x = 844,507.46
  5. Step 5: Solve for x
    x = 844,507.46/900.16
  6. Step 6: Final answer
    x = 938.17

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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.