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Finding the Fourth Proportional to 1,121.50, 1,547.69 and 679.45

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Solution

The fourth proportional to 1,121.50, 1,547.69 and 679.45 is: 937.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.50 : 1,547.69 = 679.45 : x
  2. Step 2: Convert to fraction form
    1,121.50/1,547.69 = 679.45/x
  3. Step 3: Cross multiply
    1,121.50x = 1,547.69 × 679.45
  4. Step 4: Simplify right side
    1,121.50x = 1,051,577.97
  5. Step 5: Solve for x
    x = 1,051,577.97/1,121.50
  6. Step 6: Final answer
    x = 937.65

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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.