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Finding the Fourth Proportional to 420,875.79, 631,313.68 and 105,332.69

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Solution

The fourth proportional to 420,875.79, 631,313.68 and 105,332.69 is: 157,999.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,875.79 : 631,313.68 = 105,332.69 : x
  2. Step 2: Convert to fraction form
    420,875.79/631,313.68 = 105,332.69/x
  3. Step 3: Cross multiply
    420,875.79x = 631,313.68 × 105,332.69
  4. Step 4: Simplify right side
    420,875.79x = 66,497,968,148.20
  5. Step 5: Solve for x
    x = 66,497,968,148.20/420,875.79
  6. Step 6: Final answer
    x = 157,999.03

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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.