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Finding the Fourth Proportional to 912.79, 1,259.67 and 519.83

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Solution

The fourth proportional to 912.79, 1,259.67 and 519.83 is: 717.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.79 : 1,259.67 = 519.83 : x
  2. Step 2: Convert to fraction form
    912.79/1,259.67 = 519.83/x
  3. Step 3: Cross multiply
    912.79x = 1,259.67 × 519.83
  4. Step 4: Simplify right side
    912.79x = 654,814.26
  5. Step 5: Solve for x
    x = 654,814.26/912.79
  6. Step 6: Final answer
    x = 717.38

Related Problems

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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.