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Finding the Fourth Proportional to 860.48, 1,291.08 and 470.32

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Solution

The fourth proportional to 860.48, 1,291.08 and 470.32 is: 705.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.48 : 1,291.08 = 470.32 : x
  2. Step 2: Convert to fraction form
    860.48/1,291.08 = 470.32/x
  3. Step 3: Cross multiply
    860.48x = 1,291.08 × 470.32
  4. Step 4: Simplify right side
    860.48x = 607,220.75
  5. Step 5: Solve for x
    x = 607,220.75/860.48
  6. Step 6: Final answer
    x = 705.68

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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.