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Finding the Fourth Proportional to 860.77, 1,291.71 and 373.87

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Solution

The fourth proportional to 860.77, 1,291.71 and 373.87 is: 561.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.77 : 1,291.71 = 373.87 : x
  2. Step 2: Convert to fraction form
    860.77/1,291.71 = 373.87/x
  3. Step 3: Cross multiply
    860.77x = 1,291.71 × 373.87
  4. Step 4: Simplify right side
    860.77x = 482,931.62
  5. Step 5: Solve for x
    x = 482,931.62/860.77
  6. Step 6: Final answer
    x = 561.05

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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.