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Finding the Fourth Proportional to 1,071.63, 1,475.36 and 916.11

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Solution

The fourth proportional to 1,071.63, 1,475.36 and 916.11 is: 1,261.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,071.63 : 1,475.36 = 916.11 : x
  2. Step 2: Convert to fraction form
    1,071.63/1,475.36 = 916.11/x
  3. Step 3: Cross multiply
    1,071.63x = 1,475.36 × 916.11
  4. Step 4: Simplify right side
    1,071.63x = 1,351,587.47
  5. Step 5: Solve for x
    x = 1,351,587.47/1,071.63
  6. Step 6: Final answer
    x = 1,261.24

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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.