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Finding the Fourth Proportional to 1,316.66, 1,975.03 and 342.72

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Solution

The fourth proportional to 1,316.66, 1,975.03 and 342.72 is: 514.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,316.66 : 1,975.03 = 342.72 : x
  2. Step 2: Convert to fraction form
    1,316.66/1,975.03 = 342.72/x
  3. Step 3: Cross multiply
    1,316.66x = 1,975.03 × 342.72
  4. Step 4: Simplify right side
    1,316.66x = 676,881.42
  5. Step 5: Solve for x
    x = 676,881.42/1,316.66
  6. Step 6: Final answer
    x = 514.09

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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.