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Finding the Fourth Proportional to 1,115.38, 1,539.30 and 649.63

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Solution

The fourth proportional to 1,115.38, 1,539.30 and 649.63 is: 896.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.38 : 1,539.30 = 649.63 : x
  2. Step 2: Convert to fraction form
    1,115.38/1,539.30 = 649.63/x
  3. Step 3: Cross multiply
    1,115.38x = 1,539.30 × 649.63
  4. Step 4: Simplify right side
    1,115.38x = 999,975.46
  5. Step 5: Solve for x
    x = 999,975.46/1,115.38
  6. Step 6: Final answer
    x = 896.53

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Double scale
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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.