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Finding the Fourth Proportional to 405,947.60, 608,921.40 and 389,358.80

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Solution

The fourth proportional to 405,947.60, 608,921.40 and 389,358.80 is: 584,038.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,947.60 : 608,921.40 = 389,358.80 : x
  2. Step 2: Convert to fraction form
    405,947.60/608,921.40 = 389,358.80/x
  3. Step 3: Cross multiply
    405,947.60x = 608,921.40 × 389,358.80
  4. Step 4: Simplify right side
    405,947.60x = 237,088,905,598.32
  5. Step 5: Solve for x
    x = 237,088,905,598.32/405,947.60
  6. Step 6: Final answer
    x = 584,038.20

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1.5x scale

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.