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Finding the Fourth Proportional to 145,403.40, 218,105.10 and 78,875.40

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Solution

The fourth proportional to 145,403.40, 218,105.10 and 78,875.40 is: 118,313.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,403.40 : 218,105.10 = 78,875.40 : x
  2. Step 2: Convert to fraction form
    145,403.40/218,105.10 = 78,875.40/x
  3. Step 3: Cross multiply
    145,403.40x = 218,105.10 × 78,875.40
  4. Step 4: Simplify right side
    145,403.40x = 17,203,127,004.54
  5. Step 5: Solve for x
    x = 17,203,127,004.54/145,403.40
  6. Step 6: Final answer
    x = 118,313.10

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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.