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Finding the Fourth Proportional to 1,391.95, 2,088.51 and 612.13

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Solution

The fourth proportional to 1,391.95, 2,088.51 and 612.13 is: 918.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.95 : 2,088.51 = 612.13 : x
  2. Step 2: Convert to fraction form
    1,391.95/2,088.51 = 612.13/x
  3. Step 3: Cross multiply
    1,391.95x = 2,088.51 × 612.13
  4. Step 4: Simplify right side
    1,391.95x = 1,278,439.63
  5. Step 5: Solve for x
    x = 1,278,439.63/1,391.95
  6. Step 6: Final answer
    x = 918.45

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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.