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Finding the Fourth Proportional to 916.47, 1,374.81 and 300.18

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Solution

The fourth proportional to 916.47, 1,374.81 and 300.18 is: 450.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.47 : 1,374.81 = 300.18 : x
  2. Step 2: Convert to fraction form
    916.47/1,374.81 = 300.18/x
  3. Step 3: Cross multiply
    916.47x = 1,374.81 × 300.18
  4. Step 4: Simplify right side
    916.47x = 412,686.76
  5. Step 5: Solve for x
    x = 412,686.76/916.47
  6. Step 6: Final answer
    x = 450.30

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1.5x scale

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.