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Finding the Fourth Proportional to 405,964.80, 608,947.20 and 390,412.80

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Solution

The fourth proportional to 405,964.80, 608,947.20 and 390,412.80 is: 585,619.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,964.80 : 608,947.20 = 390,412.80 : x
  2. Step 2: Convert to fraction form
    405,964.80/608,947.20 = 390,412.80/x
  3. Step 3: Cross multiply
    405,964.80x = 608,947.20 × 390,412.80
  4. Step 4: Simplify right side
    405,964.80x = 237,740,781,404.16
  5. Step 5: Solve for x
    x = 237,740,781,404.16/405,964.80
  6. Step 6: Final answer
    x = 585,619.20

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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.