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Finding the Fourth Proportional to 1,132.80, 1,563.40 and 690.67

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Solution

The fourth proportional to 1,132.80, 1,563.40 and 690.67 is: 953.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,132.80 : 1,563.40 = 690.67 : x
  2. Step 2: Convert to fraction form
    1,132.80/1,563.40 = 690.67/x
  3. Step 3: Cross multiply
    1,132.80x = 1,563.40 × 690.67
  4. Step 4: Simplify right side
    1,132.80x = 1,079,793.48
  5. Step 5: Solve for x
    x = 1,079,793.48/1,132.80
  6. Step 6: Final answer
    x = 953.21

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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.