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Finding the Fourth Proportional to 718.03, 990.21 and 607.72

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Solution

The fourth proportional to 718.03, 990.21 and 607.72 is: 838.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.03 : 990.21 = 607.72 : x
  2. Step 2: Convert to fraction form
    718.03/990.21 = 607.72/x
  3. Step 3: Cross multiply
    718.03x = 990.21 × 607.72
  4. Step 4: Simplify right side
    718.03x = 601,770.42
  5. Step 5: Solve for x
    x = 601,770.42/718.03
  6. Step 6: Final answer
    x = 838.09

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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.