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Finding the Fourth Proportional to 1,681.91, 2,320.88 and 1,240.05

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Solution

The fourth proportional to 1,681.91, 2,320.88 and 1,240.05 is: 1,711.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,681.91 : 2,320.88 = 1,240.05 : x
  2. Step 2: Convert to fraction form
    1,681.91/2,320.88 = 1,240.05/x
  3. Step 3: Cross multiply
    1,681.91x = 2,320.88 × 1,240.05
  4. Step 4: Simplify right side
    1,681.91x = 2,878,001.04
  5. Step 5: Solve for x
    x = 2,878,001.04/1,681.91
  6. Step 6: Final answer
    x = 1,711.16

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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.