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Finding the Fourth Proportional to 1,137.53, 1,569.90 and 665.40

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Solution

The fourth proportional to 1,137.53, 1,569.90 and 665.40 is: 918.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,137.53 : 1,569.90 = 665.40 : x
  2. Step 2: Convert to fraction form
    1,137.53/1,569.90 = 665.40/x
  3. Step 3: Cross multiply
    1,137.53x = 1,569.90 × 665.40
  4. Step 4: Simplify right side
    1,137.53x = 1,044,611.46
  5. Step 5: Solve for x
    x = 1,044,611.46/1,137.53
  6. Step 6: Final answer
    x = 918.32

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1.5x scale

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.