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Finding the Fourth Proportional to 860.43, 1,187.42 and 487.40

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Solution

The fourth proportional to 860.43, 1,187.42 and 487.40 is: 672.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.43 : 1,187.42 = 487.40 : x
  2. Step 2: Convert to fraction form
    860.43/1,187.42 = 487.40/x
  3. Step 3: Cross multiply
    860.43x = 1,187.42 × 487.40
  4. Step 4: Simplify right side
    860.43x = 578,748.51
  5. Step 5: Solve for x
    x = 578,748.51/860.43
  6. Step 6: Final answer
    x = 672.63

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Double scale
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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.