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Finding the Fourth Proportional to 19,990.85, 29,985.35 and 7,509.91

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Solution

The fourth proportional to 19,990.85, 29,985.35 and 7,509.91 is: 11,264.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,990.85 : 29,985.35 = 7,509.91 : x
  2. Step 2: Convert to fraction form
    19,990.85/29,985.35 = 7,509.91/x
  3. Step 3: Cross multiply
    19,990.85x = 29,985.35 × 7,509.91
  4. Step 4: Simplify right side
    19,990.85x = 225,187,223.63
  5. Step 5: Solve for x
    x = 225,187,223.63/19,990.85
  6. Step 6: Final answer
    x = 11,264.52

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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.