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Finding the Fourth Proportional to 1,188.17, 1,640.20 and 784.38

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Solution

The fourth proportional to 1,188.17, 1,640.20 and 784.38 is: 1,082.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.17 : 1,640.20 = 784.38 : x
  2. Step 2: Convert to fraction form
    1,188.17/1,640.20 = 784.38/x
  3. Step 3: Cross multiply
    1,188.17x = 1,640.20 × 784.38
  4. Step 4: Simplify right side
    1,188.17x = 1,286,545.74
  5. Step 5: Solve for x
    x = 1,286,545.74/1,188.17
  6. Step 6: Final answer
    x = 1,082.80

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1.5x scale

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.