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Finding the Fourth Proportional to 839.95, 1,254.27 and 686.18

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Solution

The fourth proportional to 839.95, 1,254.27 and 686.18 is: 1,024.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.95 : 1,254.27 = 686.18 : x
  2. Step 2: Convert to fraction form
    839.95/1,254.27 = 686.18/x
  3. Step 3: Cross multiply
    839.95x = 1,254.27 × 686.18
  4. Step 4: Simplify right side
    839.95x = 860,654.99
  5. Step 5: Solve for x
    x = 860,654.99/839.95
  6. Step 6: Final answer
    x = 1,024.65

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.