Home / 1,536.50-2,121.12-977.40

Finding the Fourth Proportional to 1,536.50, 2,121.12 and 977.40

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Solution

The fourth proportional to 1,536.50, 2,121.12 and 977.40 is: 1,349.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,536.50 : 2,121.12 = 977.40 : x
  2. Step 2: Convert to fraction form
    1,536.50/2,121.12 = 977.40/x
  3. Step 3: Cross multiply
    1,536.50x = 2,121.12 × 977.40
  4. Step 4: Simplify right side
    1,536.50x = 2,073,182.69
  5. Step 5: Solve for x
    x = 2,073,182.69/1,536.50
  6. Step 6: Final answer
    x = 1,349.29

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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.