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Finding the Fourth Proportional to 1,539.75, 2,124.87 and 918.75

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Solution

The fourth proportional to 1,539.75, 2,124.87 and 918.75 is: 1,267.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,539.75 : 2,124.87 = 918.75 : x
  2. Step 2: Convert to fraction form
    1,539.75/2,124.87 = 918.75/x
  3. Step 3: Cross multiply
    1,539.75x = 2,124.87 × 918.75
  4. Step 4: Simplify right side
    1,539.75x = 1,952,224.31
  5. Step 5: Solve for x
    x = 1,952,224.31/1,539.75
  6. Step 6: Final answer
    x = 1,267.88

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Find fourth proportional to 769.88, 1,062.44 and 459.38
Half 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.