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Finding the Fourth Proportional to 906.53, 1,357.70 and 891.47

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Solution

The fourth proportional to 906.53, 1,357.70 and 891.47 is: 1,335.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    906.53 : 1,357.70 = 891.47 : x
  2. Step 2: Convert to fraction form
    906.53/1,357.70 = 891.47/x
  3. Step 3: Cross multiply
    906.53x = 1,357.70 × 891.47
  4. Step 4: Simplify right side
    906.53x = 1,210,347.76
  5. Step 5: Solve for x
    x = 1,210,347.76/906.53
  6. Step 6: Final answer
    x = 1,335.15

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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.