Home / 21,013.16-31,500.66-10,486.40

Finding the Fourth Proportional to 21,013.16, 31,500.66 and 10,486.40

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Solution

The fourth proportional to 21,013.16, 31,500.66 and 10,486.40 is: 15,720.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,013.16 : 31,500.66 = 10,486.40 : x
  2. Step 2: Convert to fraction form
    21,013.16/31,500.66 = 10,486.40/x
  3. Step 3: Cross multiply
    21,013.16x = 31,500.66 × 10,486.40
  4. Step 4: Simplify right side
    21,013.16x = 330,328,521.02
  5. Step 5: Solve for x
    x = 330,328,521.02/21,013.16
  6. Step 6: Final answer
    x = 15,720.08

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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.