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Finding the Fourth Proportional to 718.04, 990.55 and 638.26

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Solution

The fourth proportional to 718.04, 990.55 and 638.26 is: 880.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.04 : 990.55 = 638.26 : x
  2. Step 2: Convert to fraction form
    718.04/990.55 = 638.26/x
  3. Step 3: Cross multiply
    718.04x = 990.55 × 638.26
  4. Step 4: Simplify right side
    718.04x = 632,228.44
  5. Step 5: Solve for x
    x = 632,228.44/718.04
  6. Step 6: Final answer
    x = 880.49

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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.