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Finding the Fourth Proportional to 1,120.21, 1,545.66 and 678.13

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Solution

The fourth proportional to 1,120.21, 1,545.66 and 678.13 is: 935.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.21 : 1,545.66 = 678.13 : x
  2. Step 2: Convert to fraction form
    1,120.21/1,545.66 = 678.13/x
  3. Step 3: Cross multiply
    1,120.21x = 1,545.66 × 678.13
  4. Step 4: Simplify right side
    1,120.21x = 1,048,158.42
  5. Step 5: Solve for x
    x = 1,048,158.42/1,120.21
  6. Step 6: Final answer
    x = 935.68

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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.