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Finding the Fourth Proportional to 988.18, 1,363.42 and 595.20

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Solution

The fourth proportional to 988.18, 1,363.42 and 595.20 is: 821.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.18 : 1,363.42 = 595.20 : x
  2. Step 2: Convert to fraction form
    988.18/1,363.42 = 595.20/x
  3. Step 3: Cross multiply
    988.18x = 1,363.42 × 595.20
  4. Step 4: Simplify right side
    988.18x = 811,507.58
  5. Step 5: Solve for x
    x = 811,507.58/988.18
  6. Step 6: Final answer
    x = 821.21

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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.