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Finding the Fourth Proportional to 907.23, 1,254.49 and 720.39

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Solution

The fourth proportional to 907.23, 1,254.49 and 720.39 is: 996.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.23 : 1,254.49 = 720.39 : x
  2. Step 2: Convert to fraction form
    907.23/1,254.49 = 720.39/x
  3. Step 3: Cross multiply
    907.23x = 1,254.49 × 720.39
  4. Step 4: Simplify right side
    907.23x = 903,717.11
  5. Step 5: Solve for x
    x = 903,717.11/907.23
  6. Step 6: Final answer
    x = 996.13

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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.