Home / 30,642.12-42,290.70-18,712.32

Finding the Fourth Proportional to 30,642.12, 42,290.70 and 18,712.32

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Solution

The fourth proportional to 30,642.12, 42,290.70 and 18,712.32 is: 25,825.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,642.12 : 42,290.70 = 18,712.32 : x
  2. Step 2: Convert to fraction form
    30,642.12/42,290.70 = 18,712.32/x
  3. Step 3: Cross multiply
    30,642.12x = 42,290.70 × 18,712.32
  4. Step 4: Simplify right side
    30,642.12x = 791,357,111.42
  5. Step 5: Solve for x
    x = 791,357,111.42/30,642.12
  6. Step 6: Final answer
    x = 25,825.80

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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.