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Finding the Fourth Proportional to 2,154.78, 2,973.60 and 1,223.28

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Solution

The fourth proportional to 2,154.78, 2,973.60 and 1,223.28 is: 1,688.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,154.78 : 2,973.60 = 1,223.28 : x
  2. Step 2: Convert to fraction form
    2,154.78/2,973.60 = 1,223.28/x
  3. Step 3: Cross multiply
    2,154.78x = 2,973.60 × 1,223.28
  4. Step 4: Simplify right side
    2,154.78x = 3,637,545.41
  5. Step 5: Solve for x
    x = 3,637,545.41/2,154.78
  6. Step 6: Final answer
    x = 1,688.13

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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.