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Finding the Fourth Proportional to 1,528.75, 2,109.68 and 907.75

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Solution

The fourth proportional to 1,528.75, 2,109.68 and 907.75 is: 1,252.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,528.75 : 2,109.68 = 907.75 : x
  2. Step 2: Convert to fraction form
    1,528.75/2,109.68 = 907.75/x
  3. Step 3: Cross multiply
    1,528.75x = 2,109.68 × 907.75
  4. Step 4: Simplify right side
    1,528.75x = 1,915,062.02
  5. Step 5: Solve for x
    x = 1,915,062.02/1,528.75
  6. Step 6: Final answer
    x = 1,252.70

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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.