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Finding the Fourth Proportional to 567.39, 783 and 318.72

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Solution

The fourth proportional to 567.39, 783 and 318.72 is: 439.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    567.39 : 783 = 318.72 : x
  2. Step 2: Convert to fraction form
    567.39/783 = 318.72/x
  3. Step 3: Cross multiply
    567.39x = 783 × 318.72
  4. Step 4: Simplify right side
    567.39x = 249,557.76
  5. Step 5: Solve for x
    x = 249,557.76/567.39
  6. Step 6: Final answer
    x = 439.83

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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.