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Finding the Fourth Proportional to 1,121.49, 1,547.39 and 678.62

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Solution

The fourth proportional to 1,121.49, 1,547.39 and 678.62 is: 936.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.49 : 1,547.39 = 678.62 : x
  2. Step 2: Convert to fraction form
    1,121.49/1,547.39 = 678.62/x
  3. Step 3: Cross multiply
    1,121.49x = 1,547.39 × 678.62
  4. Step 4: Simplify right side
    1,121.49x = 1,050,095.37
  5. Step 5: Solve for x
    x = 1,050,095.37/1,121.49
  6. Step 6: Final answer
    x = 936.34

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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.