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Finding the Fourth Proportional to 1,312.64, 1,968.95 and 338.74

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Solution

The fourth proportional to 1,312.64, 1,968.95 and 338.74 is: 508.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.64 : 1,968.95 = 338.74 : x
  2. Step 2: Convert to fraction form
    1,312.64/1,968.95 = 338.74/x
  3. Step 3: Cross multiply
    1,312.64x = 1,968.95 × 338.74
  4. Step 4: Simplify right side
    1,312.64x = 666,952.28
  5. Step 5: Solve for x
    x = 666,952.28/1,312.64
  6. Step 6: Final answer
    x = 508.10

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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.