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Finding the Fourth Proportional to 566.40, 781.68 and 317.76

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Solution

The fourth proportional to 566.40, 781.68 and 317.76 is: 438.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    566.40 : 781.68 = 317.76 : x
  2. Step 2: Convert to fraction form
    566.40/781.68 = 317.76/x
  3. Step 3: Cross multiply
    566.40x = 781.68 × 317.76
  4. Step 4: Simplify right side
    566.40x = 248,386.64
  5. Step 5: Solve for x
    x = 248,386.64/566.40
  6. Step 6: Final answer
    x = 438.54

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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.