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Finding the Fourth Proportional to 907.22, 1,249.63 and 710.38

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Solution

The fourth proportional to 907.22, 1,249.63 and 710.38 is: 978.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.22 : 1,249.63 = 710.38 : x
  2. Step 2: Convert to fraction form
    907.22/1,249.63 = 710.38/x
  3. Step 3: Cross multiply
    907.22x = 1,249.63 × 710.38
  4. Step 4: Simplify right side
    907.22x = 887,712.16
  5. Step 5: Solve for x
    x = 887,712.16/907.22
  6. Step 6: Final answer
    x = 978.50

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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.