Home / 30,780.63-42,480.36-18,851.85

Finding the Fourth Proportional to 30,780.63, 42,480.36 and 18,851.85

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Solution

The fourth proportional to 30,780.63, 42,480.36 and 18,851.85 is: 26,017.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,780.63 : 42,480.36 = 18,851.85 : x
  2. Step 2: Convert to fraction form
    30,780.63/42,480.36 = 18,851.85/x
  3. Step 3: Cross multiply
    30,780.63x = 42,480.36 × 18,851.85
  4. Step 4: Simplify right side
    30,780.63x = 800,833,374.67
  5. Step 5: Solve for x
    x = 800,833,374.67/30,780.63
  6. Step 6: Final answer
    x = 26,017.45

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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.