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Finding the Fourth Proportional to 910.17, 1,255.55 and 688.74

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Solution

The fourth proportional to 910.17, 1,255.55 and 688.74 is: 950.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.17 : 1,255.55 = 688.74 : x
  2. Step 2: Convert to fraction form
    910.17/1,255.55 = 688.74/x
  3. Step 3: Cross multiply
    910.17x = 1,255.55 × 688.74
  4. Step 4: Simplify right side
    910.17x = 864,744.06
  5. Step 5: Solve for x
    x = 864,744.06/910.17
  6. Step 6: Final answer
    x = 950.09

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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.