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Finding the Fourth Proportional to 807.20, 1,112.72 and 585.80

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Solution

The fourth proportional to 807.20, 1,112.72 and 585.80 is: 807.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.20 : 1,112.72 = 585.80 : x
  2. Step 2: Convert to fraction form
    807.20/1,112.72 = 585.80/x
  3. Step 3: Cross multiply
    807.20x = 1,112.72 × 585.80
  4. Step 4: Simplify right side
    807.20x = 651,831.38
  5. Step 5: Solve for x
    x = 651,831.38/807.20
  6. Step 6: Final answer
    x = 807.52

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Half scale
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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.