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Finding the Fourth Proportional to 1,113.76, 1,669.11 and 948.38

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Solution

The fourth proportional to 1,113.76, 1,669.11 and 948.38 is: 1,421.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,113.76 : 1,669.11 = 948.38 : x
  2. Step 2: Convert to fraction form
    1,113.76/1,669.11 = 948.38/x
  3. Step 3: Cross multiply
    1,113.76x = 1,669.11 × 948.38
  4. Step 4: Simplify right side
    1,113.76x = 1,582,938.64
  5. Step 5: Solve for x
    x = 1,582,938.64/1,113.76
  6. Step 6: Final answer
    x = 1,421.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.