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Finding the Fourth Proportional to 916.76, 1,374.75 and 291.91

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Solution

The fourth proportional to 916.76, 1,374.75 and 291.91 is: 437.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.76 : 1,374.75 = 291.91 : x
  2. Step 2: Convert to fraction form
    916.76/1,374.75 = 291.91/x
  3. Step 3: Cross multiply
    916.76x = 1,374.75 × 291.91
  4. Step 4: Simplify right side
    916.76x = 401,303.27
  5. Step 5: Solve for x
    x = 401,303.27/916.76
  6. Step 6: Final answer
    x = 437.74

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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.