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Finding the Fourth Proportional to 985.38, 1,358.55 and 807.69

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Solution

The fourth proportional to 985.38, 1,358.55 and 807.69 is: 1,113.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.38 : 1,358.55 = 807.69 : x
  2. Step 2: Convert to fraction form
    985.38/1,358.55 = 807.69/x
  3. Step 3: Cross multiply
    985.38x = 1,358.55 × 807.69
  4. Step 4: Simplify right side
    985.38x = 1,097,287.25
  5. Step 5: Solve for x
    x = 1,097,287.25/985.38
  6. Step 6: Final answer
    x = 1,113.57

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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.