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Finding the Fourth Proportional to 386,312.32, 579,389.57 and 146,343.49

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Solution

The fourth proportional to 386,312.32, 579,389.57 and 146,343.49 is: 219,485.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,312.32 : 579,389.57 = 146,343.49 : x
  2. Step 2: Convert to fraction form
    386,312.32/579,389.57 = 146,343.49/x
  3. Step 3: Cross multiply
    386,312.32x = 579,389.57 × 146,343.49
  4. Step 4: Simplify right side
    386,312.32x = 84,789,894,194.24
  5. Step 5: Solve for x
    x = 84,789,894,194.24/386,312.32
  6. Step 6: Final answer
    x = 219,485.35

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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.