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Finding the Fourth Proportional to 1,387.20, 1,913.09 and 914.76

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Solution

The fourth proportional to 1,387.20, 1,913.09 and 914.76 is: 1,261.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.20 : 1,913.09 = 914.76 : x
  2. Step 2: Convert to fraction form
    1,387.20/1,913.09 = 914.76/x
  3. Step 3: Cross multiply
    1,387.20x = 1,913.09 × 914.76
  4. Step 4: Simplify right side
    1,387.20x = 1,750,013.63
  5. Step 5: Solve for x
    x = 1,750,013.63/1,387.20
  6. Step 6: Final answer
    x = 1,261.54

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