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Finding the Fourth Proportional to 390,353.48, 538,688.79 and 218,277.69

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Solution

The fourth proportional to 390,353.48, 538,688.79 and 218,277.69 is: 301,223.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,353.48 : 538,688.79 = 218,277.69 : x
  2. Step 2: Convert to fraction form
    390,353.48/538,688.79 = 218,277.69/x
  3. Step 3: Cross multiply
    390,353.48x = 538,688.79 × 218,277.69
  4. Step 4: Simplify right side
    390,353.48x = 117,583,744,710.10
  5. Step 5: Solve for x
    x = 117,583,744,710.10/390,353.48
  6. Step 6: Final answer
    x = 301,223.76

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.