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Finding the Fourth Proportional to 913.91, 1,260.80 and 559.69

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Solution

The fourth proportional to 913.91, 1,260.80 and 559.69 is: 772.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.91 : 1,260.80 = 559.69 : x
  2. Step 2: Convert to fraction form
    913.91/1,260.80 = 559.69/x
  3. Step 3: Cross multiply
    913.91x = 1,260.80 × 559.69
  4. Step 4: Simplify right side
    913.91x = 705,657.15
  5. Step 5: Solve for x
    x = 705,657.15/913.91
  6. Step 6: Final answer
    x = 772.13

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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.