Home / 10,112.95-15,178.47-6,421.78

Finding the Fourth Proportional to 10,112.95, 15,178.47 and 6,421.78

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Solution

The fourth proportional to 10,112.95, 15,178.47 and 6,421.78 is: 9,638.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,112.95 : 15,178.47 = 6,421.78 : x
  2. Step 2: Convert to fraction form
    10,112.95/15,178.47 = 6,421.78/x
  3. Step 3: Cross multiply
    10,112.95x = 15,178.47 × 6,421.78
  4. Step 4: Simplify right side
    10,112.95x = 97,472,795.08
  5. Step 5: Solve for x
    x = 97,472,795.08/10,112.95
  6. Step 6: Final answer
    x = 9,638.41

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.