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Finding the Fourth Proportional to 340.61, 510.91 and 318.74

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Solution

The fourth proportional to 340.61, 510.91 and 318.74 is: 478.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    340.61 : 510.91 = 318.74 : x
  2. Step 2: Convert to fraction form
    340.61/510.91 = 318.74/x
  3. Step 3: Cross multiply
    340.61x = 510.91 × 318.74
  4. Step 4: Simplify right side
    340.61x = 162,844.10
  5. Step 5: Solve for x
    x = 162,844.10/340.61
  6. Step 6: Final answer
    x = 478.10

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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.