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Finding the Fourth Proportional to 715.59, 986.61 and 494.16

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Solution

The fourth proportional to 715.59, 986.61 and 494.16 is: 681.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.59 : 986.61 = 494.16 : x
  2. Step 2: Convert to fraction form
    715.59/986.61 = 494.16/x
  3. Step 3: Cross multiply
    715.59x = 986.61 × 494.16
  4. Step 4: Simplify right side
    715.59x = 487,543.20
  5. Step 5: Solve for x
    x = 487,543.20/715.59
  6. Step 6: Final answer
    x = 681.32

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Double scale
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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.