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Finding the Fourth Proportional to 520,070.60, 780,105.90 and 306,619.40

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Solution

The fourth proportional to 520,070.60, 780,105.90 and 306,619.40 is: 459,929.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,070.60 : 780,105.90 = 306,619.40 : x
  2. Step 2: Convert to fraction form
    520,070.60/780,105.90 = 306,619.40/x
  3. Step 3: Cross multiply
    520,070.60x = 780,105.90 × 306,619.40
  4. Step 4: Simplify right side
    520,070.60x = 239,195,602,994.46
  5. Step 5: Solve for x
    x = 239,195,602,994.46/520,070.60
  6. Step 6: Final answer
    x = 459,929.10

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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.