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Finding the Fourth Proportional to 1,536.65, 2,120.55 and 907.20

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Solution

The fourth proportional to 1,536.65, 2,120.55 and 907.20 is: 1,251.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,536.65 : 2,120.55 = 907.20 : x
  2. Step 2: Convert to fraction form
    1,536.65/2,120.55 = 907.20/x
  3. Step 3: Cross multiply
    1,536.65x = 2,120.55 × 907.20
  4. Step 4: Simplify right side
    1,536.65x = 1,923,767.21
  5. Step 5: Solve for x
    x = 1,923,767.21/1,536.65
  6. Step 6: Final answer
    x = 1,251.93

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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.