Home / 1,440.17-1,987.42-810.70

Finding the Fourth Proportional to 1,440.17, 1,987.42 and 810.70

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Solution

The fourth proportional to 1,440.17, 1,987.42 and 810.70 is: 1,118.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,440.17 : 1,987.42 = 810.70 : x
  2. Step 2: Convert to fraction form
    1,440.17/1,987.42 = 810.70/x
  3. Step 3: Cross multiply
    1,440.17x = 1,987.42 × 810.70
  4. Step 4: Simplify right side
    1,440.17x = 1,611,201.85
  5. Step 5: Solve for x
    x = 1,611,201.85/1,440.17
  6. Step 6: Final answer
    x = 1,118.76

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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.