Home / 15,781.98-21,779.24-8,612.40

Finding the Fourth Proportional to 15,781.98, 21,779.24 and 8,612.40

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Solution

The fourth proportional to 15,781.98, 21,779.24 and 8,612.40 is: 11,885.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,781.98 : 21,779.24 = 8,612.40 : x
  2. Step 2: Convert to fraction form
    15,781.98/21,779.24 = 8,612.40/x
  3. Step 3: Cross multiply
    15,781.98x = 21,779.24 × 8,612.40
  4. Step 4: Simplify right side
    15,781.98x = 187,571,483.51
  5. Step 5: Solve for x
    x = 187,571,483.51/15,781.98
  6. Step 6: Final answer
    x = 11,885.17

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.