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Finding the Fourth Proportional to 672.80, 1,009.20 and 564.40

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Solution

The fourth proportional to 672.80, 1,009.20 and 564.40 is: 846.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.80 : 1,009.20 = 564.40 : x
  2. Step 2: Convert to fraction form
    672.80/1,009.20 = 564.40/x
  3. Step 3: Cross multiply
    672.80x = 1,009.20 × 564.40
  4. Step 4: Simplify right side
    672.80x = 569,592.48
  5. Step 5: Solve for x
    x = 569,592.48/672.80
  6. Step 6: Final answer
    x = 846.60

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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.