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Finding the Fourth Proportional to 860.76, 1,188.19 and 581.80

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Solution

The fourth proportional to 860.76, 1,188.19 and 581.80 is: 803.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.76 : 1,188.19 = 581.80 : x
  2. Step 2: Convert to fraction form
    860.76/1,188.19 = 581.80/x
  3. Step 3: Cross multiply
    860.76x = 1,188.19 × 581.80
  4. Step 4: Simplify right side
    860.76x = 691,288.94
  5. Step 5: Solve for x
    x = 691,288.94/860.76
  6. Step 6: Final answer
    x = 803.11

Related Problems

Find fourth proportional to 430.38, 594.10 and 290.90
Half scale
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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.