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Finding the Fourth Proportional to 1,155.10, 1,595.16 and 988.34

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Solution

The fourth proportional to 1,155.10, 1,595.16 and 988.34 is: 1,364.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,155.10 : 1,595.16 = 988.34 : x
  2. Step 2: Convert to fraction form
    1,155.10/1,595.16 = 988.34/x
  3. Step 3: Cross multiply
    1,155.10x = 1,595.16 × 988.34
  4. Step 4: Simplify right side
    1,155.10x = 1,576,560.43
  5. Step 5: Solve for x
    x = 1,576,560.43/1,155.10
  6. Step 6: Final answer
    x = 1,364.87

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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.