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Finding the Fourth Proportional to 916.39, 1,374.06 and 428.98

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Solution

The fourth proportional to 916.39, 1,374.06 and 428.98 is: 643.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.39 : 1,374.06 = 428.98 : x
  2. Step 2: Convert to fraction form
    916.39/1,374.06 = 428.98/x
  3. Step 3: Cross multiply
    916.39x = 1,374.06 × 428.98
  4. Step 4: Simplify right side
    916.39x = 589,444.26
  5. Step 5: Solve for x
    x = 589,444.26/916.39
  6. Step 6: Final answer
    x = 643.22

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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.