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Finding the Fourth Proportional to 988.22, 1,363.59 and 657.14

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Solution

The fourth proportional to 988.22, 1,363.59 and 657.14 is: 906.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.22 : 1,363.59 = 657.14 : x
  2. Step 2: Convert to fraction form
    988.22/1,363.59 = 657.14/x
  3. Step 3: Cross multiply
    988.22x = 1,363.59 × 657.14
  4. Step 4: Simplify right side
    988.22x = 896,062.71
  5. Step 5: Solve for x
    x = 896,062.71/988.22
  6. Step 6: Final answer
    x = 906.74

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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.