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Finding the Fourth Proportional to 1,397.10, 1,927.99 and 807.63

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Solution

The fourth proportional to 1,397.10, 1,927.99 and 807.63 is: 1,114.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,397.10 : 1,927.99 = 807.63 : x
  2. Step 2: Convert to fraction form
    1,397.10/1,927.99 = 807.63/x
  3. Step 3: Cross multiply
    1,397.10x = 1,927.99 × 807.63
  4. Step 4: Simplify right side
    1,397.10x = 1,557,091.80
  5. Step 5: Solve for x
    x = 1,557,091.80/1,397.10
  6. Step 6: Final answer
    x = 1,114.51

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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.