Home / 30,543.31-42,140.60-19,771.12

Finding the Fourth Proportional to 30,543.31, 42,140.60 and 19,771.12

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Solution

The fourth proportional to 30,543.31, 42,140.60 and 19,771.12 is: 27,278.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,543.31 : 42,140.60 = 19,771.12 : x
  2. Step 2: Convert to fraction form
    30,543.31/42,140.60 = 19,771.12/x
  3. Step 3: Cross multiply
    30,543.31x = 42,140.60 × 19,771.12
  4. Step 4: Simplify right side
    30,543.31x = 833,166,887.43
  5. Step 5: Solve for x
    x = 833,166,887.43/30,543.31
  6. Step 6: Final answer
    x = 27,278.21

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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.