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Finding the Fourth Proportional to 860.40, 1,289.72 and 373.04

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Solution

The fourth proportional to 860.40, 1,289.72 and 373.04 is: 559.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.40 : 1,289.72 = 373.04 : x
  2. Step 2: Convert to fraction form
    860.40/1,289.72 = 373.04/x
  3. Step 3: Cross multiply
    860.40x = 1,289.72 × 373.04
  4. Step 4: Simplify right side
    860.40x = 481,117.15
  5. Step 5: Solve for x
    x = 481,117.15/860.40
  6. Step 6: Final answer
    x = 559.18

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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.