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Finding the Fourth Proportional to 513,964.80, 770,947.20 and 139,987.20

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Solution

The fourth proportional to 513,964.80, 770,947.20 and 139,987.20 is: 209,980.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    513,964.80 : 770,947.20 = 139,987.20 : x
  2. Step 2: Convert to fraction form
    513,964.80/770,947.20 = 139,987.20/x
  3. Step 3: Cross multiply
    513,964.80x = 770,947.20 × 139,987.20
  4. Step 4: Simplify right side
    513,964.80x = 107,922,739,875.84
  5. Step 5: Solve for x
    x = 107,922,739,875.84/513,964.80
  6. Step 6: Final answer
    x = 209,980.80

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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.