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Finding the Fourth Proportional to 948.58, 1,420.98 and 753.91

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Solution

The fourth proportional to 948.58, 1,420.98 and 753.91 is: 1,129.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.58 : 1,420.98 = 753.91 : x
  2. Step 2: Convert to fraction form
    948.58/1,420.98 = 753.91/x
  3. Step 3: Cross multiply
    948.58x = 1,420.98 × 753.91
  4. Step 4: Simplify right side
    948.58x = 1,071,291.03
  5. Step 5: Solve for x
    x = 1,071,291.03/948.58
  6. Step 6: Final answer
    x = 1,129.36

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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.