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Finding the Fourth Proportional to 1,275.99, 1,913.91 and 626.50

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Solution

The fourth proportional to 1,275.99, 1,913.91 and 626.50 is: 939.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.99 : 1,913.91 = 626.50 : x
  2. Step 2: Convert to fraction form
    1,275.99/1,913.91 = 626.50/x
  3. Step 3: Cross multiply
    1,275.99x = 1,913.91 × 626.50
  4. Step 4: Simplify right side
    1,275.99x = 1,199,064.62
  5. Step 5: Solve for x
    x = 1,199,064.62/1,275.99
  6. Step 6: Final answer
    x = 939.71

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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.