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Finding the Fourth Proportional to 916.61, 1,374.63 and 770.40

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Solution

The fourth proportional to 916.61, 1,374.63 and 770.40 is: 1,155.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.61 : 1,374.63 = 770.40 : x
  2. Step 2: Convert to fraction form
    916.61/1,374.63 = 770.40/x
  3. Step 3: Cross multiply
    916.61x = 1,374.63 × 770.40
  4. Step 4: Simplify right side
    916.61x = 1,059,014.95
  5. Step 5: Solve for x
    x = 1,059,014.95/916.61
  6. Step 6: Final answer
    x = 1,155.37

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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.