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Finding the Fourth Proportional to 696.81, 1,045.35 and 312.06

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Solution

The fourth proportional to 696.81, 1,045.35 and 312.06 is: 468.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    696.81 : 1,045.35 = 312.06 : x
  2. Step 2: Convert to fraction form
    696.81/1,045.35 = 312.06/x
  3. Step 3: Cross multiply
    696.81x = 1,045.35 × 312.06
  4. Step 4: Simplify right side
    696.81x = 326,211.92
  5. Step 5: Solve for x
    x = 326,211.92/696.81
  6. Step 6: Final answer
    x = 468.15

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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.