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Finding the Fourth Proportional to 895.47, 1,240.85 and 840.66

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Solution

The fourth proportional to 895.47, 1,240.85 and 840.66 is: 1,164.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    895.47 : 1,240.85 = 840.66 : x
  2. Step 2: Convert to fraction form
    895.47/1,240.85 = 840.66/x
  3. Step 3: Cross multiply
    895.47x = 1,240.85 × 840.66
  4. Step 4: Simplify right side
    895.47x = 1,043,128.76
  5. Step 5: Solve for x
    x = 1,043,128.76/895.47
  6. Step 6: Final answer
    x = 1,164.90

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.