Home / 30,999.61-42,707.14-21,551.77

Finding the Fourth Proportional to 30,999.61, 42,707.14 and 21,551.77

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Solution

The fourth proportional to 30,999.61, 42,707.14 and 21,551.77 is: 29,691.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,999.61 : 42,707.14 = 21,551.77 : x
  2. Step 2: Convert to fraction form
    30,999.61/42,707.14 = 21,551.77/x
  3. Step 3: Cross multiply
    30,999.61x = 42,707.14 × 21,551.77
  4. Step 4: Simplify right side
    30,999.61x = 920,414,458.64
  5. Step 5: Solve for x
    x = 920,414,458.64/30,999.61
  6. Step 6: Final answer
    x = 29,691.16

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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.