Home / 1,398.13-1,929.09-1,342.78

Finding the Fourth Proportional to 1,398.13, 1,929.09 and 1,342.78

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Solution

The fourth proportional to 1,398.13, 1,929.09 and 1,342.78 is: 1,852.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398.13 : 1,929.09 = 1,342.78 : x
  2. Step 2: Convert to fraction form
    1,398.13/1,929.09 = 1,342.78/x
  3. Step 3: Cross multiply
    1,398.13x = 1,929.09 × 1,342.78
  4. Step 4: Simplify right side
    1,398.13x = 2,590,343.47
  5. Step 5: Solve for x
    x = 2,590,343.47/1,398.13
  6. Step 6: Final answer
    x = 1,852.72

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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.