Home / 1,121.40-1,547.58-617.28

Finding the Fourth Proportional to 1,121.40, 1,547.58 and 617.28

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Solution

The fourth proportional to 1,121.40, 1,547.58 and 617.28 is: 851.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.40 : 1,547.58 = 617.28 : x
  2. Step 2: Convert to fraction form
    1,121.40/1,547.58 = 617.28/x
  3. Step 3: Cross multiply
    1,121.40x = 1,547.58 × 617.28
  4. Step 4: Simplify right side
    1,121.40x = 955,290.18
  5. Step 5: Solve for x
    x = 955,290.18/1,121.40
  6. Step 6: Final answer
    x = 851.87

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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.