Home / 15,585.47-21,507.35-8,779.36

Finding the Fourth Proportional to 15,585.47, 21,507.35 and 8,779.36

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Solution

The fourth proportional to 15,585.47, 21,507.35 and 8,779.36 is: 12,115.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,585.47 : 21,507.35 = 8,779.36 : x
  2. Step 2: Convert to fraction form
    15,585.47/21,507.35 = 8,779.36/x
  3. Step 3: Cross multiply
    15,585.47x = 21,507.35 × 8,779.36
  4. Step 4: Simplify right side
    15,585.47x = 188,820,616.86
  5. Step 5: Solve for x
    x = 188,820,616.86/15,585.47
  6. Step 6: Final answer
    x = 12,115.17

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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.