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Finding the Fourth Proportional to 1,856.16, 2,781.36 and 990.24

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Solution

The fourth proportional to 1,856.16, 2,781.36 and 990.24 is: 1,483.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,856.16 : 2,781.36 = 990.24 : x
  2. Step 2: Convert to fraction form
    1,856.16/2,781.36 = 990.24/x
  3. Step 3: Cross multiply
    1,856.16x = 2,781.36 × 990.24
  4. Step 4: Simplify right side
    1,856.16x = 2,754,213.93
  5. Step 5: Solve for x
    x = 2,754,213.93/1,856.16
  6. Step 6: Final answer
    x = 1,483.82

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.