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Finding the Fourth Proportional to 1,528.12, 2,108.70 and 907

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Solution

The fourth proportional to 1,528.12, 2,108.70 and 907 is: 1,251.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,528.12 : 2,108.70 = 907 : x
  2. Step 2: Convert to fraction form
    1,528.12/2,108.70 = 907/x
  3. Step 3: Cross multiply
    1,528.12x = 2,108.70 × 907
  4. Step 4: Simplify right side
    1,528.12x = 1,912,590.90
  5. Step 5: Solve for x
    x = 1,912,590.90/1,528.12
  6. Step 6: Final answer
    x = 1,251.60

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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.