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Finding the Fourth Proportional to 1,869.48, 2,803.72 and 990.80

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Solution

The fourth proportional to 1,869.48, 2,803.72 and 990.80 is: 1,485.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,869.48 : 2,803.72 = 990.80 : x
  2. Step 2: Convert to fraction form
    1,869.48/2,803.72 = 990.80/x
  3. Step 3: Cross multiply
    1,869.48x = 2,803.72 × 990.80
  4. Step 4: Simplify right side
    1,869.48x = 2,777,925.78
  5. Step 5: Solve for x
    x = 2,777,925.78/1,869.48
  6. Step 6: Final answer
    x = 1,485.94

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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.