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Finding the Fourth Proportional to 1,287.70, 1,935.83 and 1,045.91

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Solution

The fourth proportional to 1,287.70, 1,935.83 and 1,045.91 is: 1,572.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.70 : 1,935.83 = 1,045.91 : x
  2. Step 2: Convert to fraction form
    1,287.70/1,935.83 = 1,045.91/x
  3. Step 3: Cross multiply
    1,287.70x = 1,935.83 × 1,045.91
  4. Step 4: Simplify right side
    1,287.70x = 2,024,711.41
  5. Step 5: Solve for x
    x = 2,024,711.41/1,287.70
  6. Step 6: Final answer
    x = 1,572.35

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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.