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Finding the Fourth Proportional to 900.84, 1,243.71 and 621.57

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Solution

The fourth proportional to 900.84, 1,243.71 and 621.57 is: 858.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.84 : 1,243.71 = 621.57 : x
  2. Step 2: Convert to fraction form
    900.84/1,243.71 = 621.57/x
  3. Step 3: Cross multiply
    900.84x = 1,243.71 × 621.57
  4. Step 4: Simplify right side
    900.84x = 773,052.82
  5. Step 5: Solve for x
    x = 773,052.82/900.84
  6. Step 6: Final answer
    x = 858.15

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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.