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Finding the Fourth Proportional to 257,079.12, 385,670.76 and 90,983.76

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Solution

The fourth proportional to 257,079.12, 385,670.76 and 90,983.76 is: 136,494.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,079.12 : 385,670.76 = 90,983.76 : x
  2. Step 2: Convert to fraction form
    257,079.12/385,670.76 = 90,983.76/x
  3. Step 3: Cross multiply
    257,079.12x = 385,670.76 × 90,983.76
  4. Step 4: Simplify right side
    257,079.12x = 35,089,775,866.86
  5. Step 5: Solve for x
    x = 35,089,775,866.86/257,079.12
  6. Step 6: Final answer
    x = 136,494.07

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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.