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Finding the Fourth Proportional to 910.19, 1,256.21 and 517.45

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Solution

The fourth proportional to 910.19, 1,256.21 and 517.45 is: 714.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.19 : 1,256.21 = 517.45 : x
  2. Step 2: Convert to fraction form
    910.19/1,256.21 = 517.45/x
  3. Step 3: Cross multiply
    910.19x = 1,256.21 × 517.45
  4. Step 4: Simplify right side
    910.19x = 650,025.86
  5. Step 5: Solve for x
    x = 650,025.86/910.19
  6. Step 6: Final answer
    x = 714.17

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Half scale
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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.