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Finding the Fourth Proportional to 718.30, 990.12 and 587.08

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Solution

The fourth proportional to 718.30, 990.12 and 587.08 is: 809.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.30 : 990.12 = 587.08 : x
  2. Step 2: Convert to fraction form
    718.30/990.12 = 587.08/x
  3. Step 3: Cross multiply
    718.30x = 990.12 × 587.08
  4. Step 4: Simplify right side
    718.30x = 581,279.65
  5. Step 5: Solve for x
    x = 581,279.65/718.30
  6. Step 6: Final answer
    x = 809.24

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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.