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Finding the Fourth Proportional to 1,120.84, 1,547.08 and 678.78

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Solution

The fourth proportional to 1,120.84, 1,547.08 and 678.78 is: 936.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.84 : 1,547.08 = 678.78 : x
  2. Step 2: Convert to fraction form
    1,120.84/1,547.08 = 678.78/x
  3. Step 3: Cross multiply
    1,120.84x = 1,547.08 × 678.78
  4. Step 4: Simplify right side
    1,120.84x = 1,050,126.96
  5. Step 5: Solve for x
    x = 1,050,126.96/1,120.84
  6. Step 6: Final answer
    x = 936.91

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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.