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Finding the Fourth Proportional to 559,980.80, 839,971.20 and 420,012.80

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Solution

The fourth proportional to 559,980.80, 839,971.20 and 420,012.80 is: 630,019.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    559,980.80 : 839,971.20 = 420,012.80 : x
  2. Step 2: Convert to fraction form
    559,980.80/839,971.20 = 420,012.80/x
  3. Step 3: Cross multiply
    559,980.80x = 839,971.20 × 420,012.80
  4. Step 4: Simplify right side
    559,980.80x = 352,798,655,631.36
  5. Step 5: Solve for x
    x = 352,798,655,631.36/559,980.80
  6. Step 6: Final answer
    x = 630,019.20

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Double scale
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Similar ratio
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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.