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Finding the Fourth Proportional to 613,430.80, 920,146.20 and 347,710.30

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Solution

The fourth proportional to 613,430.80, 920,146.20 and 347,710.30 is: 521,565.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    613,430.80 : 920,146.20 = 347,710.30 : x
  2. Step 2: Convert to fraction form
    613,430.80/920,146.20 = 347,710.30/x
  3. Step 3: Cross multiply
    613,430.80x = 920,146.20 × 347,710.30
  4. Step 4: Simplify right side
    613,430.80x = 319,944,311,245.86
  5. Step 5: Solve for x
    x = 319,944,311,245.86/613,430.80
  6. Step 6: Final answer
    x = 521,565.45

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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.