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Finding the Fourth Proportional to 910.71, 1,256.39 and 561.19

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Solution

The fourth proportional to 910.71, 1,256.39 and 561.19 is: 774.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.71 : 1,256.39 = 561.19 : x
  2. Step 2: Convert to fraction form
    910.71/1,256.39 = 561.19/x
  3. Step 3: Cross multiply
    910.71x = 1,256.39 × 561.19
  4. Step 4: Simplify right side
    910.71x = 705,070.70
  5. Step 5: Solve for x
    x = 705,070.70/910.71
  6. Step 6: Final answer
    x = 774.20

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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.