Home / 420,200.52-630,300.86-139,720.20

Finding the Fourth Proportional to 420,200.52, 630,300.86 and 139,720.20

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Solution

The fourth proportional to 420,200.52, 630,300.86 and 139,720.20 is: 209,580.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,200.52 : 630,300.86 = 139,720.20 : x
  2. Step 2: Convert to fraction form
    420,200.52/630,300.86 = 139,720.20/x
  3. Step 3: Cross multiply
    420,200.52x = 630,300.86 × 139,720.20
  4. Step 4: Simplify right side
    420,200.52x = 88,065,762,219.37
  5. Step 5: Solve for x
    x = 88,065,762,219.37/420,200.52
  6. Step 6: Final answer
    x = 209,580.33

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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.