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Finding the Fourth Proportional to 1,140.69, 1,711.08 and 490.98

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Solution

The fourth proportional to 1,140.69, 1,711.08 and 490.98 is: 736.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,140.69 : 1,711.08 = 490.98 : x
  2. Step 2: Convert to fraction form
    1,140.69/1,711.08 = 490.98/x
  3. Step 3: Cross multiply
    1,140.69x = 1,711.08 × 490.98
  4. Step 4: Simplify right side
    1,140.69x = 840,106.06
  5. Step 5: Solve for x
    x = 840,106.06/1,140.69
  6. Step 6: Final answer
    x = 736.49

Related Problems

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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.