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Finding the Fourth Proportional to 30,574.80, 42,159.56 and 19,944.40

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Solution

The fourth proportional to 30,574.80, 42,159.56 and 19,944.40 is: 27,501.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,574.80 : 42,159.56 = 19,944.40 : x
  2. Step 2: Convert to fraction form
    30,574.80/42,159.56 = 19,944.40/x
  3. Step 3: Cross multiply
    30,574.80x = 42,159.56 × 19,944.40
  4. Step 4: Simplify right side
    30,574.80x = 840,847,128.46
  5. Step 5: Solve for x
    x = 840,847,128.46/30,574.80
  6. Step 6: Final answer
    x = 27,501.31

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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.