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Finding the Fourth Proportional to 897.39, 1,239.57 and 661.82

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Solution

The fourth proportional to 897.39, 1,239.57 and 661.82 is: 914.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    897.39 : 1,239.57 = 661.82 : x
  2. Step 2: Convert to fraction form
    897.39/1,239.57 = 661.82/x
  3. Step 3: Cross multiply
    897.39x = 1,239.57 × 661.82
  4. Step 4: Simplify right side
    897.39x = 820,366.02
  5. Step 5: Solve for x
    x = 820,366.02/897.39
  6. Step 6: Final answer
    x = 914.17

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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.