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Finding the Fourth Proportional to 1,137.48, 1,569.54 and 665.40

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Solution

The fourth proportional to 1,137.48, 1,569.54 and 665.40 is: 918.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,137.48 : 1,569.54 = 665.40 : x
  2. Step 2: Convert to fraction form
    1,137.48/1,569.54 = 665.40/x
  3. Step 3: Cross multiply
    1,137.48x = 1,569.54 × 665.40
  4. Step 4: Simplify right side
    1,137.48x = 1,044,371.92
  5. Step 5: Solve for x
    x = 1,044,371.92/1,137.48
  6. Step 6: Final answer
    x = 918.15

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Double scale
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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.