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Finding the Fourth Proportional to 1,358.78, 1,875.56 and 1,239.84

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Solution

The fourth proportional to 1,358.78, 1,875.56 and 1,239.84 is: 1,711.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,358.78 : 1,875.56 = 1,239.84 : x
  2. Step 2: Convert to fraction form
    1,358.78/1,875.56 = 1,239.84/x
  3. Step 3: Cross multiply
    1,358.78x = 1,875.56 × 1,239.84
  4. Step 4: Simplify right side
    1,358.78x = 2,325,388.11
  5. Step 5: Solve for x
    x = 2,325,388.11/1,358.78
  6. Step 6: Final answer
    x = 1,711.39

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1.5x scale

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.