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Finding the Fourth Proportional to 319,415.20, 478,719.60 and 161,687.20

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Solution

The fourth proportional to 319,415.20, 478,719.60 and 161,687.20 is: 242,326.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    319,415.20 : 478,719.60 = 161,687.20 : x
  2. Step 2: Convert to fraction form
    319,415.20/478,719.60 = 161,687.20/x
  3. Step 3: Cross multiply
    319,415.20x = 478,719.60 × 161,687.20
  4. Step 4: Simplify right side
    319,415.20x = 77,402,831,709.12
  5. Step 5: Solve for x
    x = 77,402,831,709.12/319,415.20
  6. Step 6: Final answer
    x = 242,326.70

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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.