Home / 10,921.81-15,071.40-6,445.75

Finding the Fourth Proportional to 10,921.81, 15,071.40 and 6,445.75

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Solution

The fourth proportional to 10,921.81, 15,071.40 and 6,445.75 is: 8,894.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,921.81 : 15,071.40 = 6,445.75 : x
  2. Step 2: Convert to fraction form
    10,921.81/15,071.40 = 6,445.75/x
  3. Step 3: Cross multiply
    10,921.81x = 15,071.40 × 6,445.75
  4. Step 4: Simplify right side
    10,921.81x = 97,146,476.55
  5. Step 5: Solve for x
    x = 97,146,476.55/10,921.81
  6. Step 6: Final answer
    x = 8,894.72

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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.