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Finding the Fourth Proportional to 1,398.30, 1,916.10 and 1,347.30

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Solution

The fourth proportional to 1,398.30, 1,916.10 and 1,347.30 is: 1,846.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398.30 : 1,916.10 = 1,347.30 : x
  2. Step 2: Convert to fraction form
    1,398.30/1,916.10 = 1,347.30/x
  3. Step 3: Cross multiply
    1,398.30x = 1,916.10 × 1,347.30
  4. Step 4: Simplify right side
    1,398.30x = 2,581,561.53
  5. Step 5: Solve for x
    x = 2,581,561.53/1,398.30
  6. Step 6: Final answer
    x = 1,846.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.