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Finding the Fourth Proportional to 830.61, 1,245.95 and 368.39

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Solution

The fourth proportional to 830.61, 1,245.95 and 368.39 is: 552.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.61 : 1,245.95 = 368.39 : x
  2. Step 2: Convert to fraction form
    830.61/1,245.95 = 368.39/x
  3. Step 3: Cross multiply
    830.61x = 1,245.95 × 368.39
  4. Step 4: Simplify right side
    830.61x = 458,998.17
  5. Step 5: Solve for x
    x = 458,998.17/830.61
  6. Step 6: Final answer
    x = 552.60

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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.