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Finding the Fourth Proportional to 1,398.75, 1,931.49 and 1,051.26

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Solution

The fourth proportional to 1,398.75, 1,931.49 and 1,051.26 is: 1,451.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398.75 : 1,931.49 = 1,051.26 : x
  2. Step 2: Convert to fraction form
    1,398.75/1,931.49 = 1,051.26/x
  3. Step 3: Cross multiply
    1,398.75x = 1,931.49 × 1,051.26
  4. Step 4: Simplify right side
    1,398.75x = 2,030,498.18
  5. Step 5: Solve for x
    x = 2,030,498.18/1,398.75
  6. Step 6: Final answer
    x = 1,451.65

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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.