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Finding the Fourth Proportional to 928.23, 1,280.49 and 707.40

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Solution

The fourth proportional to 928.23, 1,280.49 and 707.40 is: 975.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.23 : 1,280.49 = 707.40 : x
  2. Step 2: Convert to fraction form
    928.23/1,280.49 = 707.40/x
  3. Step 3: Cross multiply
    928.23x = 1,280.49 × 707.40
  4. Step 4: Simplify right side
    928.23x = 905,818.63
  5. Step 5: Solve for x
    x = 905,818.63/928.23
  6. Step 6: Final answer
    x = 975.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.