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Finding the Fourth Proportional to 1,045.70, 1,442.48 and 666.87

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Solution

The fourth proportional to 1,045.70, 1,442.48 and 666.87 is: 919.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,045.70 : 1,442.48 = 666.87 : x
  2. Step 2: Convert to fraction form
    1,045.70/1,442.48 = 666.87/x
  3. Step 3: Cross multiply
    1,045.70x = 1,442.48 × 666.87
  4. Step 4: Simplify right side
    1,045.70x = 961,943.30
  5. Step 5: Solve for x
    x = 961,943.30/1,045.70
  6. Step 6: Final answer
    x = 919.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.