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Finding the Fourth Proportional to 912.39, 1,368.06 and 424.98

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Solution

The fourth proportional to 912.39, 1,368.06 and 424.98 is: 637.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.39 : 1,368.06 = 424.98 : x
  2. Step 2: Convert to fraction form
    912.39/1,368.06 = 424.98/x
  3. Step 3: Cross multiply
    912.39x = 1,368.06 × 424.98
  4. Step 4: Simplify right side
    912.39x = 581,398.14
  5. Step 5: Solve for x
    x = 581,398.14/912.39
  6. Step 6: Final answer
    x = 637.23

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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.