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Finding the Fourth Proportional to 808.70, 1,115.06 and 560.22

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Solution

The fourth proportional to 808.70, 1,115.06 and 560.22 is: 772.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.70 : 1,115.06 = 560.22 : x
  2. Step 2: Convert to fraction form
    808.70/1,115.06 = 560.22/x
  3. Step 3: Cross multiply
    808.70x = 1,115.06 × 560.22
  4. Step 4: Simplify right side
    808.70x = 624,678.91
  5. Step 5: Solve for x
    x = 624,678.91/808.70
  6. Step 6: Final answer
    x = 772.45

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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.