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Finding the Fourth Proportional to 1,277.61, 1,762.88 and 717.99

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Solution

The fourth proportional to 1,277.61, 1,762.88 and 717.99 is: 990.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,277.61 : 1,762.88 = 717.99 : x
  2. Step 2: Convert to fraction form
    1,277.61/1,762.88 = 717.99/x
  3. Step 3: Cross multiply
    1,277.61x = 1,762.88 × 717.99
  4. Step 4: Simplify right side
    1,277.61x = 1,265,726.62
  5. Step 5: Solve for x
    x = 1,265,726.62/1,277.61
  6. Step 6: Final answer
    x = 990.70

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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.