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Finding the Fourth Proportional to 386,670.60, 579,349.80 and 319,748.40

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Solution

The fourth proportional to 386,670.60, 579,349.80 and 319,748.40 is: 479,080.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,670.60 : 579,349.80 = 319,748.40 : x
  2. Step 2: Convert to fraction form
    386,670.60/579,349.80 = 319,748.40/x
  3. Step 3: Cross multiply
    386,670.60x = 579,349.80 × 319,748.40
  4. Step 4: Simplify right side
    386,670.60x = 185,246,171,590.32
  5. Step 5: Solve for x
    x = 185,246,171,590.32/386,670.60
  6. Step 6: Final answer
    x = 479,080.05

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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.