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Finding the Fourth Proportional to 1,990.74, 2,987.10 and 895.50

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Solution

The fourth proportional to 1,990.74, 2,987.10 and 895.50 is: 1,343.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.74 : 2,987.10 = 895.50 : x
  2. Step 2: Convert to fraction form
    1,990.74/2,987.10 = 895.50/x
  3. Step 3: Cross multiply
    1,990.74x = 2,987.10 × 895.50
  4. Step 4: Simplify right side
    1,990.74x = 2,674,948.05
  5. Step 5: Solve for x
    x = 2,674,948.05/1,990.74
  6. Step 6: Final answer
    x = 1,343.70

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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.