Home / 30,945.48-42,690.90-20,870.64

Finding the Fourth Proportional to 30,945.48, 42,690.90 and 20,870.64

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Solution

The fourth proportional to 30,945.48, 42,690.90 and 20,870.64 is: 28,792.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,945.48 : 42,690.90 = 20,870.64 : x
  2. Step 2: Convert to fraction form
    30,945.48/42,690.90 = 20,870.64/x
  3. Step 3: Cross multiply
    30,945.48x = 42,690.90 × 20,870.64
  4. Step 4: Simplify right side
    30,945.48x = 890,986,405.18
  5. Step 5: Solve for x
    x = 890,986,405.18/30,945.48
  6. Step 6: Final answer
    x = 28,792.13

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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.