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Finding the Fourth Proportional to 910.79, 1,364.13 and 638.10

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Solution

The fourth proportional to 910.79, 1,364.13 and 638.10 is: 955.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.79 : 1,364.13 = 638.10 : x
  2. Step 2: Convert to fraction form
    910.79/1,364.13 = 638.10/x
  3. Step 3: Cross multiply
    910.79x = 1,364.13 × 638.10
  4. Step 4: Simplify right side
    910.79x = 870,442.91
  5. Step 5: Solve for x
    x = 870,442.91/910.79
  6. Step 6: Final answer
    x = 955.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.