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Finding the Fourth Proportional to 900.88, 1,243.47 and 638.98

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Solution

The fourth proportional to 900.88, 1,243.47 and 638.98 is: 881.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.88 : 1,243.47 = 638.98 : x
  2. Step 2: Convert to fraction form
    900.88/1,243.47 = 638.98/x
  3. Step 3: Cross multiply
    900.88x = 1,243.47 × 638.98
  4. Step 4: Simplify right side
    900.88x = 794,552.46
  5. Step 5: Solve for x
    x = 794,552.46/900.88
  6. Step 6: Final answer
    x = 881.97

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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.