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Finding the Fourth Proportional to 912.99, 1,259.45 and 539.70

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Solution

The fourth proportional to 912.99, 1,259.45 and 539.70 is: 744.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.99 : 1,259.45 = 539.70 : x
  2. Step 2: Convert to fraction form
    912.99/1,259.45 = 539.70/x
  3. Step 3: Cross multiply
    912.99x = 1,259.45 × 539.70
  4. Step 4: Simplify right side
    912.99x = 679,722.47
  5. Step 5: Solve for x
    x = 679,722.47/912.99
  6. Step 6: Final answer
    x = 744.50

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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.