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Finding the Fourth Proportional to 21,045.15, 31,572.90 and 7,005.15

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Solution

The fourth proportional to 21,045.15, 31,572.90 and 7,005.15 is: 10,509.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,045.15 : 31,572.90 = 7,005.15 : x
  2. Step 2: Convert to fraction form
    21,045.15/31,572.90 = 7,005.15/x
  3. Step 3: Cross multiply
    21,045.15x = 31,572.90 × 7,005.15
  4. Step 4: Simplify right side
    21,045.15x = 221,172,900.44
  5. Step 5: Solve for x
    x = 221,172,900.44/21,045.15
  6. Step 6: Final answer
    x = 10,509.45

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1.5x scale

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.