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Finding the Fourth Proportional to 385,339.40, 578,009.10 and 163,723.40

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Solution

The fourth proportional to 385,339.40, 578,009.10 and 163,723.40 is: 245,585.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,339.40 : 578,009.10 = 163,723.40 : x
  2. Step 2: Convert to fraction form
    385,339.40/578,009.10 = 163,723.40/x
  3. Step 3: Cross multiply
    385,339.40x = 578,009.10 × 163,723.40
  4. Step 4: Simplify right side
    385,339.40x = 94,633,615,082.94
  5. Step 5: Solve for x
    x = 94,633,615,082.94/385,339.40
  6. Step 6: Final answer
    x = 245,585.10

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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.