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Finding the Fourth Proportional to 907.40, 1,251.78 and 558.02

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Solution

The fourth proportional to 907.40, 1,251.78 and 558.02 is: 769.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.40 : 1,251.78 = 558.02 : x
  2. Step 2: Convert to fraction form
    907.40/1,251.78 = 558.02/x
  3. Step 3: Cross multiply
    907.40x = 1,251.78 × 558.02
  4. Step 4: Simplify right side
    907.40x = 698,518.28
  5. Step 5: Solve for x
    x = 698,518.28/907.40
  6. Step 6: Final answer
    x = 769.80

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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.