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Finding the Fourth Proportional to 1,325.57, 1,990.16 and 913.69

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Solution

The fourth proportional to 1,325.57, 1,990.16 and 913.69 is: 1,371.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,325.57 : 1,990.16 = 913.69 : x
  2. Step 2: Convert to fraction form
    1,325.57/1,990.16 = 913.69/x
  3. Step 3: Cross multiply
    1,325.57x = 1,990.16 × 913.69
  4. Step 4: Simplify right side
    1,325.57x = 1,818,374.77
  5. Step 5: Solve for x
    x = 1,818,374.77/1,325.57
  6. Step 6: Final answer
    x = 1,371.77

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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.