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Finding the Fourth Proportional to 70,390.86, 105,509.49 and 25,980.18

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Solution

The fourth proportional to 70,390.86, 105,509.49 and 25,980.18 is: 38,941.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,390.86 : 105,509.49 = 25,980.18 : x
  2. Step 2: Convert to fraction form
    70,390.86/105,509.49 = 25,980.18/x
  3. Step 3: Cross multiply
    70,390.86x = 105,509.49 × 25,980.18
  4. Step 4: Simplify right side
    70,390.86x = 2,741,155,541.91
  5. Step 5: Solve for x
    x = 2,741,155,541.91/70,390.86
  6. Step 6: Final answer
    x = 38,941.92

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.