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Finding the Fourth Proportional to 718.24, 990.84 and 423.40

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Solution

The fourth proportional to 718.24, 990.84 and 423.40 is: 584.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.24 : 990.84 = 423.40 : x
  2. Step 2: Convert to fraction form
    718.24/990.84 = 423.40/x
  3. Step 3: Cross multiply
    718.24x = 990.84 × 423.40
  4. Step 4: Simplify right side
    718.24x = 419,521.66
  5. Step 5: Solve for x
    x = 419,521.66/718.24
  6. Step 6: Final answer
    x = 584.10

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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.