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Finding the Fourth Proportional to 860.70, 1,187.73 and 467.70

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Solution

The fourth proportional to 860.70, 1,187.73 and 467.70 is: 645.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.70 : 1,187.73 = 467.70 : x
  2. Step 2: Convert to fraction form
    860.70/1,187.73 = 467.70/x
  3. Step 3: Cross multiply
    860.70x = 1,187.73 × 467.70
  4. Step 4: Simplify right side
    860.70x = 555,501.32
  5. Step 5: Solve for x
    x = 555,501.32/860.70
  6. Step 6: Final answer
    x = 645.41

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.