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Finding the Fourth Proportional to 1,252.90, 1,878.37 and 430.95

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Solution

The fourth proportional to 1,252.90, 1,878.37 and 430.95 is: 646.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,252.90 : 1,878.37 = 430.95 : x
  2. Step 2: Convert to fraction form
    1,252.90/1,878.37 = 430.95/x
  3. Step 3: Cross multiply
    1,252.90x = 1,878.37 × 430.95
  4. Step 4: Simplify right side
    1,252.90x = 809,482.47
  5. Step 5: Solve for x
    x = 809,482.47/1,252.90
  6. Step 6: Final answer
    x = 646.09

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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.