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Finding the Fourth Proportional to 1,275.21, 1,759.77 and 715.71

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Solution

The fourth proportional to 1,275.21, 1,759.77 and 715.71 is: 987.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.21 : 1,759.77 = 715.71 : x
  2. Step 2: Convert to fraction form
    1,275.21/1,759.77 = 715.71/x
  3. Step 3: Cross multiply
    1,275.21x = 1,759.77 × 715.71
  4. Step 4: Simplify right side
    1,275.21x = 1,259,484.99
  5. Step 5: Solve for x
    x = 1,259,484.99/1,275.21
  6. Step 6: Final answer
    x = 987.67

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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.