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Finding the Fourth Proportional to 386,300.40, 578,138.40 and 339,061.20

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Solution

The fourth proportional to 386,300.40, 578,138.40 and 339,061.20 is: 507,440.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,300.40 : 578,138.40 = 339,061.20 : x
  2. Step 2: Convert to fraction form
    386,300.40/578,138.40 = 339,061.20/x
  3. Step 3: Cross multiply
    386,300.40x = 578,138.40 × 339,061.20
  4. Step 4: Simplify right side
    386,300.40x = 196,024,299,670.08
  5. Step 5: Solve for x
    x = 196,024,299,670.08/386,300.40
  6. Step 6: Final answer
    x = 507,440.06

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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.