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Finding the Fourth Proportional to 907.12, 1,250.76 and 557.20

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Solution

The fourth proportional to 907.12, 1,250.76 and 557.20 is: 768.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.12 : 1,250.76 = 557.20 : x
  2. Step 2: Convert to fraction form
    907.12/1,250.76 = 557.20/x
  3. Step 3: Cross multiply
    907.12x = 1,250.76 × 557.20
  4. Step 4: Simplify right side
    907.12x = 696,923.47
  5. Step 5: Solve for x
    x = 696,923.47/907.12
  6. Step 6: Final answer
    x = 768.28

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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.