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Finding the Fourth Proportional to 1,136.76, 1,568.56 and 639.40

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Solution

The fourth proportional to 1,136.76, 1,568.56 and 639.40 is: 882.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,136.76 : 1,568.56 = 639.40 : x
  2. Step 2: Convert to fraction form
    1,136.76/1,568.56 = 639.40/x
  3. Step 3: Cross multiply
    1,136.76x = 1,568.56 × 639.40
  4. Step 4: Simplify right side
    1,136.76x = 1,002,937.26
  5. Step 5: Solve for x
    x = 1,002,937.26/1,136.76
  6. Step 6: Final answer
    x = 882.28

Related Problems

Find fourth proportional to 568.38, 784.28 and 319.70
Half scale
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Double scale
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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.