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Finding the Fourth Proportional to 1,047.88, 1,572.87 and 931.51

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Solution

The fourth proportional to 1,047.88, 1,572.87 and 931.51 is: 1,398.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,047.88 : 1,572.87 = 931.51 : x
  2. Step 2: Convert to fraction form
    1,047.88/1,572.87 = 931.51/x
  3. Step 3: Cross multiply
    1,047.88x = 1,572.87 × 931.51
  4. Step 4: Simplify right side
    1,047.88x = 1,465,144.13
  5. Step 5: Solve for x
    x = 1,465,144.13/1,047.88
  6. Step 6: Final answer
    x = 1,398.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.