Home / 12,420.67-17,139.48-7,315.37

Finding the Fourth Proportional to 12,420.67, 17,139.48 and 7,315.37

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Solution

The fourth proportional to 12,420.67, 17,139.48 and 7,315.37 is: 10,094.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,420.67 : 17,139.48 = 7,315.37 : x
  2. Step 2: Convert to fraction form
    12,420.67/17,139.48 = 7,315.37/x
  3. Step 3: Cross multiply
    12,420.67x = 17,139.48 × 7,315.37
  4. Step 4: Simplify right side
    12,420.67x = 125,381,637.81
  5. Step 5: Solve for x
    x = 125,381,637.81/12,420.67
  6. Step 6: Final answer
    x = 10,094.60

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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.