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Finding the Fourth Proportional to 912.16, 1,368.80 and 425.25

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Solution

The fourth proportional to 912.16, 1,368.80 and 425.25 is: 638.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.16 : 1,368.80 = 425.25 : x
  2. Step 2: Convert to fraction form
    912.16/1,368.80 = 425.25/x
  3. Step 3: Cross multiply
    912.16x = 1,368.80 × 425.25
  4. Step 4: Simplify right side
    912.16x = 582,081.67
  5. Step 5: Solve for x
    x = 582,081.67/912.16
  6. Step 6: Final answer
    x = 638.13

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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.