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Finding the Fourth Proportional to 918.16, 1,264.92 and 751.40

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Solution

The fourth proportional to 918.16, 1,264.92 and 751.40 is: 1,035.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.16 : 1,264.92 = 751.40 : x
  2. Step 2: Convert to fraction form
    918.16/1,264.92 = 751.40/x
  3. Step 3: Cross multiply
    918.16x = 1,264.92 × 751.40
  4. Step 4: Simplify right side
    918.16x = 950,466.87
  5. Step 5: Solve for x
    x = 950,466.87/918.16
  6. Step 6: Final answer
    x = 1,035.19

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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.