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Finding the Fourth Proportional to 833.12, 1,248.98 and 312.83

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Solution

The fourth proportional to 833.12, 1,248.98 and 312.83 is: 468.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    833.12 : 1,248.98 = 312.83 : x
  2. Step 2: Convert to fraction form
    833.12/1,248.98 = 312.83/x
  3. Step 3: Cross multiply
    833.12x = 1,248.98 × 312.83
  4. Step 4: Simplify right side
    833.12x = 390,718.41
  5. Step 5: Solve for x
    x = 390,718.41/833.12
  6. Step 6: Final answer
    x = 468.98

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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.