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Finding the Fourth Proportional to 390,005.60, 584,133.60 and 320,021.60

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Solution

The fourth proportional to 390,005.60, 584,133.60 and 320,021.60 is: 479,314.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,005.60 : 584,133.60 = 320,021.60 : x
  2. Step 2: Convert to fraction form
    390,005.60/584,133.60 = 320,021.60/x
  3. Step 3: Cross multiply
    390,005.60x = 584,133.60 × 320,021.60
  4. Step 4: Simplify right side
    390,005.60x = 186,935,369,285.76
  5. Step 5: Solve for x
    x = 186,935,369,285.76/390,005.60
  6. Step 6: Final answer
    x = 479,314.58

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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.