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Finding the Fourth Proportional to 2,453.78, 3,678.98 and 787.36

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Solution

The fourth proportional to 2,453.78, 3,678.98 and 787.36 is: 1,180.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,453.78 : 3,678.98 = 787.36 : x
  2. Step 2: Convert to fraction form
    2,453.78/3,678.98 = 787.36/x
  3. Step 3: Cross multiply
    2,453.78x = 3,678.98 × 787.36
  4. Step 4: Simplify right side
    2,453.78x = 2,896,681.69
  5. Step 5: Solve for x
    x = 2,896,681.69/2,453.78
  6. Step 6: Final answer
    x = 1,180.50

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1.5x scale

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.