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Finding the Fourth Proportional to 559,987.80, 839,981.70 and 420,019.80

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Solution

The fourth proportional to 559,987.80, 839,981.70 and 420,019.80 is: 630,029.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    559,987.80 : 839,981.70 = 420,019.80 : x
  2. Step 2: Convert to fraction form
    559,987.80/839,981.70 = 420,019.80/x
  3. Step 3: Cross multiply
    559,987.80x = 839,981.70 × 420,019.80
  4. Step 4: Simplify right side
    559,987.80x = 352,808,945,637.66
  5. Step 5: Solve for x
    x = 352,808,945,637.66/559,987.80
  6. Step 6: Final answer
    x = 630,029.70

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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.