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Finding the Fourth Proportional to 1,398.02, 1,929.13 and 838.39

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Solution

The fourth proportional to 1,398.02, 1,929.13 and 838.39 is: 1,156.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398.02 : 1,929.13 = 838.39 : x
  2. Step 2: Convert to fraction form
    1,398.02/1,929.13 = 838.39/x
  3. Step 3: Cross multiply
    1,398.02x = 1,929.13 × 838.39
  4. Step 4: Simplify right side
    1,398.02x = 1,617,363.30
  5. Step 5: Solve for x
    x = 1,617,363.30/1,398.02
  6. Step 6: Final answer
    x = 1,156.90

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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.