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Finding the Fourth Proportional to 860.04, 1,280.72 and 857.61

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Solution

The fourth proportional to 860.04, 1,280.72 and 857.61 is: 1,277.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.04 : 1,280.72 = 857.61 : x
  2. Step 2: Convert to fraction form
    860.04/1,280.72 = 857.61/x
  3. Step 3: Cross multiply
    860.04x = 1,280.72 × 857.61
  4. Step 4: Simplify right side
    860.04x = 1,098,360.42
  5. Step 5: Solve for x
    x = 1,098,360.42/860.04
  6. Step 6: Final answer
    x = 1,277.10

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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.