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Finding the Fourth Proportional to 910.47, 1,256.72 and 579.15

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Solution

The fourth proportional to 910.47, 1,256.72 and 579.15 is: 799.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.47 : 1,256.72 = 579.15 : x
  2. Step 2: Convert to fraction form
    910.47/1,256.72 = 579.15/x
  3. Step 3: Cross multiply
    910.47x = 1,256.72 × 579.15
  4. Step 4: Simplify right side
    910.47x = 727,826.49
  5. Step 5: Solve for x
    x = 727,826.49/910.47
  6. Step 6: Final answer
    x = 799.40

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Double scale
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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.