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Finding the Fourth Proportional to 910.68, 1,256.80 and 711.76

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Solution

The fourth proportional to 910.68, 1,256.80 and 711.76 is: 982.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.68 : 1,256.80 = 711.76 : x
  2. Step 2: Convert to fraction form
    910.68/1,256.80 = 711.76/x
  3. Step 3: Cross multiply
    910.68x = 1,256.80 × 711.76
  4. Step 4: Simplify right side
    910.68x = 894,545.28
  5. Step 5: Solve for x
    x = 894,545.28/910.68
  6. Step 6: Final answer
    x = 982.28

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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.