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Finding the Fourth Proportional to 912.75, 1,259.40 and 539.48

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Solution

The fourth proportional to 912.75, 1,259.40 and 539.48 is: 744.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.75 : 1,259.40 = 539.48 : x
  2. Step 2: Convert to fraction form
    912.75/1,259.40 = 539.48/x
  3. Step 3: Cross multiply
    912.75x = 1,259.40 × 539.48
  4. Step 4: Simplify right side
    912.75x = 679,421.11
  5. Step 5: Solve for x
    x = 679,421.11/912.75
  6. Step 6: Final answer
    x = 744.37

Related Problems

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Half scale
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Double scale
Find fourth proportional to 913.75, 1,260.78 and 540.48
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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.