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Finding the Fourth Proportional to 771.52, 1,155.93 and 642.35

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Solution

The fourth proportional to 771.52, 1,155.93 and 642.35 is: 962.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.52 : 1,155.93 = 642.35 : x
  2. Step 2: Convert to fraction form
    771.52/1,155.93 = 642.35/x
  3. Step 3: Cross multiply
    771.52x = 1,155.93 × 642.35
  4. Step 4: Simplify right side
    771.52x = 742,510.67
  5. Step 5: Solve for x
    x = 742,510.67/771.52
  6. Step 6: Final answer
    x = 962.40

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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.