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Finding the Fourth Proportional to 718.16, 990.44 and 507.92

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Solution

The fourth proportional to 718.16, 990.44 and 507.92 is: 700.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.16 : 990.44 = 507.92 : x
  2. Step 2: Convert to fraction form
    718.16/990.44 = 507.92/x
  3. Step 3: Cross multiply
    718.16x = 990.44 × 507.92
  4. Step 4: Simplify right side
    718.16x = 503,064.28
  5. Step 5: Solve for x
    x = 503,064.28/718.16
  6. Step 6: Final answer
    x = 700.49

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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.