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Finding the Fourth Proportional to 897.74, 1,346.36 and 312.65

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Solution

The fourth proportional to 897.74, 1,346.36 and 312.65 is: 468.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    897.74 : 1,346.36 = 312.65 : x
  2. Step 2: Convert to fraction form
    897.74/1,346.36 = 312.65/x
  3. Step 3: Cross multiply
    897.74x = 1,346.36 × 312.65
  4. Step 4: Simplify right side
    897.74x = 420,931.16
  5. Step 5: Solve for x
    x = 420,931.16/897.74
  6. Step 6: Final answer
    x = 468.88

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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.