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Finding the Fourth Proportional to 860.76, 1,290.06 and 398.52

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Solution

The fourth proportional to 860.76, 1,290.06 and 398.52 is: 597.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.76 : 1,290.06 = 398.52 : x
  2. Step 2: Convert to fraction form
    860.76/1,290.06 = 398.52/x
  3. Step 3: Cross multiply
    860.76x = 1,290.06 × 398.52
  4. Step 4: Simplify right side
    860.76x = 514,114.71
  5. Step 5: Solve for x
    x = 514,114.71/860.76
  6. Step 6: Final answer
    x = 597.28

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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.