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Finding the Fourth Proportional to 1,726.95, 2,590.80 and 631.31

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Solution

The fourth proportional to 1,726.95, 2,590.80 and 631.31 is: 947.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,726.95 : 2,590.80 = 631.31 : x
  2. Step 2: Convert to fraction form
    1,726.95/2,590.80 = 631.31/x
  3. Step 3: Cross multiply
    1,726.95x = 2,590.80 × 631.31
  4. Step 4: Simplify right side
    1,726.95x = 1,635,604.43
  5. Step 5: Solve for x
    x = 1,635,604.43/1,726.95
  6. Step 6: Final answer
    x = 947.11

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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.