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Finding the Fourth Proportional to 907.48, 1,254.83 and 720.64

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Solution

The fourth proportional to 907.48, 1,254.83 and 720.64 is: 996.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.48 : 1,254.83 = 720.64 : x
  2. Step 2: Convert to fraction form
    907.48/1,254.83 = 720.64/x
  3. Step 3: Cross multiply
    907.48x = 1,254.83 × 720.64
  4. Step 4: Simplify right side
    907.48x = 904,279.36
  5. Step 5: Solve for x
    x = 904,279.36/907.48
  6. Step 6: Final answer
    x = 996.48

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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.