Home / 100,688.18-138,948.41-55,365.80

Finding the Fourth Proportional to 100,688.18, 138,948.41 and 55,365.80

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Solution

The fourth proportional to 100,688.18, 138,948.41 and 55,365.80 is: 76,404.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,688.18 : 138,948.41 = 55,365.80 : x
  2. Step 2: Convert to fraction form
    100,688.18/138,948.41 = 55,365.80/x
  3. Step 3: Cross multiply
    100,688.18x = 138,948.41 × 55,365.80
  4. Step 4: Simplify right side
    100,688.18x = 7,692,989,322.05
  5. Step 5: Solve for x
    x = 7,692,989,322.05/100,688.18
  6. Step 6: Final answer
    x = 76,404.10

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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.