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Finding the Fourth Proportional to 1,113.60, 1,670.40 and 724.80

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Solution

The fourth proportional to 1,113.60, 1,670.40 and 724.80 is: 1,087.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,113.60 : 1,670.40 = 724.80 : x
  2. Step 2: Convert to fraction form
    1,113.60/1,670.40 = 724.80/x
  3. Step 3: Cross multiply
    1,113.60x = 1,670.40 × 724.80
  4. Step 4: Simplify right side
    1,113.60x = 1,210,705.92
  5. Step 5: Solve for x
    x = 1,210,705.92/1,113.60
  6. Step 6: Final answer
    x = 1,087.20

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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.