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Finding the Fourth Proportional to 257,975.16, 386,813.28 and 100,018.68

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Solution

The fourth proportional to 257,975.16, 386,813.28 and 100,018.68 is: 149,970.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,975.16 : 386,813.28 = 100,018.68 : x
  2. Step 2: Convert to fraction form
    257,975.16/386,813.28 = 100,018.68/x
  3. Step 3: Cross multiply
    257,975.16x = 386,813.28 × 100,018.68
  4. Step 4: Simplify right side
    257,975.16x = 38,688,553,672.07
  5. Step 5: Solve for x
    x = 38,688,553,672.07/257,975.16
  6. Step 6: Final answer
    x = 149,970.07

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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.