Home / 420,209.25-630,319.35-139,726.50

Finding the Fourth Proportional to 420,209.25, 630,319.35 and 139,726.50

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Solution

The fourth proportional to 420,209.25, 630,319.35 and 139,726.50 is: 209,591.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,209.25 : 630,319.35 = 139,726.50 : x
  2. Step 2: Convert to fraction form
    420,209.25/630,319.35 = 139,726.50/x
  3. Step 3: Cross multiply
    420,209.25x = 630,319.35 × 139,726.50
  4. Step 4: Simplify right side
    420,209.25x = 88,072,316,657.78
  5. Step 5: Solve for x
    x = 88,072,316,657.78/420,209.25
  6. Step 6: Final answer
    x = 209,591.57

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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.