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Finding the Fourth Proportional to 15,030.40, 20,741.56 and 8,315.84

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Solution

The fourth proportional to 15,030.40, 20,741.56 and 8,315.84 is: 11,475.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,030.40 : 20,741.56 = 8,315.84 : x
  2. Step 2: Convert to fraction form
    15,030.40/20,741.56 = 8,315.84/x
  3. Step 3: Cross multiply
    15,030.40x = 20,741.56 × 8,315.84
  4. Step 4: Simplify right side
    15,030.40x = 172,483,494.31
  5. Step 5: Solve for x
    x = 172,483,494.31/15,030.40
  6. Step 6: Final answer
    x = 11,475.64

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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.