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Finding the Fourth Proportional to 1,764.01, 2,434.40 and 978.13

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Solution

The fourth proportional to 1,764.01, 2,434.40 and 978.13 is: 1,349.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,764.01 : 2,434.40 = 978.13 : x
  2. Step 2: Convert to fraction form
    1,764.01/2,434.40 = 978.13/x
  3. Step 3: Cross multiply
    1,764.01x = 2,434.40 × 978.13
  4. Step 4: Simplify right side
    1,764.01x = 2,381,159.67
  5. Step 5: Solve for x
    x = 2,381,159.67/1,764.01
  6. Step 6: Final answer
    x = 1,349.86

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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.