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Finding the Fourth Proportional to 421,672.80, 632,509.20 and 402,319.20

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Solution

The fourth proportional to 421,672.80, 632,509.20 and 402,319.20 is: 603,478.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,672.80 : 632,509.20 = 402,319.20 : x
  2. Step 2: Convert to fraction form
    421,672.80/632,509.20 = 402,319.20/x
  3. Step 3: Cross multiply
    421,672.80x = 632,509.20 × 402,319.20
  4. Step 4: Simplify right side
    421,672.80x = 254,470,595,336.64
  5. Step 5: Solve for x
    x = 254,470,595,336.64/421,672.80
  6. Step 6: Final answer
    x = 603,478.80

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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.