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Finding the Fourth Proportional to 567.48, 783.20 and 318.86

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Solution

The fourth proportional to 567.48, 783.20 and 318.86 is: 440.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    567.48 : 783.20 = 318.86 : x
  2. Step 2: Convert to fraction form
    567.48/783.20 = 318.86/x
  3. Step 3: Cross multiply
    567.48x = 783.20 × 318.86
  4. Step 4: Simplify right side
    567.48x = 249,731.15
  5. Step 5: Solve for x
    x = 249,731.15/567.48
  6. Step 6: Final answer
    x = 440.07

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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.