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Finding the Fourth Proportional to 897.71, 1,345.07 and 312.39

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Solution

The fourth proportional to 897.71, 1,345.07 and 312.39 is: 468.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    897.71 : 1,345.07 = 312.39 : x
  2. Step 2: Convert to fraction form
    897.71/1,345.07 = 312.39/x
  3. Step 3: Cross multiply
    897.71x = 1,345.07 × 312.39
  4. Step 4: Simplify right side
    897.71x = 420,184.86
  5. Step 5: Solve for x
    x = 420,184.86/897.71
  6. Step 6: Final answer
    x = 468.07

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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.