Home / 15,781.63-21,779.11-8,708.51

Finding the Fourth Proportional to 15,781.63, 21,779.11 and 8,708.51

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Solution

The fourth proportional to 15,781.63, 21,779.11 and 8,708.51 is: 12,018.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,781.63 : 21,779.11 = 8,708.51 : x
  2. Step 2: Convert to fraction form
    15,781.63/21,779.11 = 8,708.51/x
  3. Step 3: Cross multiply
    15,781.63x = 21,779.11 × 8,708.51
  4. Step 4: Simplify right side
    15,781.63x = 189,663,597.23
  5. Step 5: Solve for x
    x = 189,663,597.23/15,781.63
  6. Step 6: Final answer
    x = 12,018.00

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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.