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Finding the Fourth Proportional to 925.51, 1,275.45 and 663.07

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Solution

The fourth proportional to 925.51, 1,275.45 and 663.07 is: 913.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.51 : 1,275.45 = 663.07 : x
  2. Step 2: Convert to fraction form
    925.51/1,275.45 = 663.07/x
  3. Step 3: Cross multiply
    925.51x = 1,275.45 × 663.07
  4. Step 4: Simplify right side
    925.51x = 845,712.63
  5. Step 5: Solve for x
    x = 845,712.63/925.51
  6. Step 6: Final answer
    x = 913.78

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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.