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Finding the Fourth Proportional to 912.81, 1,259.69 and 519.87

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Solution

The fourth proportional to 912.81, 1,259.69 and 519.87 is: 717.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.81 : 1,259.69 = 519.87 : x
  2. Step 2: Convert to fraction form
    912.81/1,259.69 = 519.87/x
  3. Step 3: Cross multiply
    912.81x = 1,259.69 × 519.87
  4. Step 4: Simplify right side
    912.81x = 654,875.04
  5. Step 5: Solve for x
    x = 654,875.04/912.81
  6. Step 6: Final answer
    x = 717.43

Related Problems

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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.