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Finding the Fourth Proportional to 719.26, 990.20 and 631.90

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Solution

The fourth proportional to 719.26, 990.20 and 631.90 is: 869.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.26 : 990.20 = 631.90 : x
  2. Step 2: Convert to fraction form
    719.26/990.20 = 631.90/x
  3. Step 3: Cross multiply
    719.26x = 990.20 × 631.90
  4. Step 4: Simplify right side
    719.26x = 625,707.38
  5. Step 5: Solve for x
    x = 625,707.38/719.26
  6. Step 6: Final answer
    x = 869.93

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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.