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Finding the Fourth Proportional to 390,933.80, 586,400.70 and 390,933.80

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Solution

The fourth proportional to 390,933.80, 586,400.70 and 390,933.80 is: 586,400.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,933.80 : 586,400.70 = 390,933.80 : x
  2. Step 2: Convert to fraction form
    390,933.80/586,400.70 = 390,933.80/x
  3. Step 3: Cross multiply
    390,933.80x = 586,400.70 × 390,933.80
  4. Step 4: Simplify right side
    390,933.80x = 229,243,853,973.66
  5. Step 5: Solve for x
    x = 229,243,853,973.66/390,933.80
  6. Step 6: Final answer
    x = 586,400.70

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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.