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Finding the Fourth Proportional to 1,153.53, 1,591.61 and 711.45

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Solution

The fourth proportional to 1,153.53, 1,591.61 and 711.45 is: 981.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,153.53 : 1,591.61 = 711.45 : x
  2. Step 2: Convert to fraction form
    1,153.53/1,591.61 = 711.45/x
  3. Step 3: Cross multiply
    1,153.53x = 1,591.61 × 711.45
  4. Step 4: Simplify right side
    1,153.53x = 1,132,347.38
  5. Step 5: Solve for x
    x = 1,132,347.38/1,153.53
  6. Step 6: Final answer
    x = 981.64

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