Home / 15,779.79-21,774.60-8,705.76

Finding the Fourth Proportional to 15,779.79, 21,774.60 and 8,705.76

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Solution

The fourth proportional to 15,779.79, 21,774.60 and 8,705.76 is: 12,013.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,779.79 : 21,774.60 = 8,705.76 : x
  2. Step 2: Convert to fraction form
    15,779.79/21,774.60 = 8,705.76/x
  3. Step 3: Cross multiply
    15,779.79x = 21,774.60 × 8,705.76
  4. Step 4: Simplify right side
    15,779.79x = 189,564,360.04
  5. Step 5: Solve for x
    x = 189,564,360.04/15,779.79
  6. Step 6: Final answer
    x = 12,013.11

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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.