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Finding the Fourth Proportional to 1,277.62, 1,762.92 and 718.10

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Solution

The fourth proportional to 1,277.62, 1,762.92 and 718.10 is: 990.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,277.62 : 1,762.92 = 718.10 : x
  2. Step 2: Convert to fraction form
    1,277.62/1,762.92 = 718.10/x
  3. Step 3: Cross multiply
    1,277.62x = 1,762.92 × 718.10
  4. Step 4: Simplify right side
    1,277.62x = 1,265,952.85
  5. Step 5: Solve for x
    x = 1,265,952.85/1,277.62
  6. Step 6: Final answer
    x = 990.87

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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.