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Finding the Fourth Proportional to 860.68, 1,291.86 and 373.90

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Solution

The fourth proportional to 860.68, 1,291.86 and 373.90 is: 561.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.68 : 1,291.86 = 373.90 : x
  2. Step 2: Convert to fraction form
    860.68/1,291.86 = 373.90/x
  3. Step 3: Cross multiply
    860.68x = 1,291.86 × 373.90
  4. Step 4: Simplify right side
    860.68x = 483,026.45
  5. Step 5: Solve for x
    x = 483,026.45/860.68
  6. Step 6: Final answer
    x = 561.21

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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.