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Finding the Fourth Proportional to 472,945.80, 709,418.70 and 140,521.80

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Solution

The fourth proportional to 472,945.80, 709,418.70 and 140,521.80 is: 210,782.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    472,945.80 : 709,418.70 = 140,521.80 : x
  2. Step 2: Convert to fraction form
    472,945.80/709,418.70 = 140,521.80/x
  3. Step 3: Cross multiply
    472,945.80x = 709,418.70 × 140,521.80
  4. Step 4: Simplify right side
    472,945.80x = 99,688,792,677.66
  5. Step 5: Solve for x
    x = 99,688,792,677.66/472,945.80
  6. Step 6: Final answer
    x = 210,782.70

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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.