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Finding the Fourth Proportional to 907.08, 1,248.54 and 812.28

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Solution

The fourth proportional to 907.08, 1,248.54 and 812.28 is: 1,118.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.08 : 1,248.54 = 812.28 : x
  2. Step 2: Convert to fraction form
    907.08/1,248.54 = 812.28/x
  3. Step 3: Cross multiply
    907.08x = 1,248.54 × 812.28
  4. Step 4: Simplify right side
    907.08x = 1,014,164.07
  5. Step 5: Solve for x
    x = 1,014,164.07/907.08
  6. Step 6: Final answer
    x = 1,118.05

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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.