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Finding the Fourth Proportional to 1,111.73, 1,530.90 and 953.19

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Solution

The fourth proportional to 1,111.73, 1,530.90 and 953.19 is: 1,312.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,111.73 : 1,530.90 = 953.19 : x
  2. Step 2: Convert to fraction form
    1,111.73/1,530.90 = 953.19/x
  3. Step 3: Cross multiply
    1,111.73x = 1,530.90 × 953.19
  4. Step 4: Simplify right side
    1,111.73x = 1,459,238.57
  5. Step 5: Solve for x
    x = 1,459,238.57/1,111.73
  6. Step 6: Final answer
    x = 1,312.59

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Double scale
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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.