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Finding the Fourth Proportional to 615.12, 918.12 and 542.22

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Solution

The fourth proportional to 615.12, 918.12 and 542.22 is: 809.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.12 : 918.12 = 542.22 : x
  2. Step 2: Convert to fraction form
    615.12/918.12 = 542.22/x
  3. Step 3: Cross multiply
    615.12x = 918.12 × 542.22
  4. Step 4: Simplify right side
    615.12x = 497,823.03
  5. Step 5: Solve for x
    x = 497,823.03/615.12
  6. Step 6: Final answer
    x = 809.31

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.