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Finding the Fourth Proportional to 520,071.20, 780,106.80 and 379,066.40

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Solution

The fourth proportional to 520,071.20, 780,106.80 and 379,066.40 is: 568,599.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,071.20 : 780,106.80 = 379,066.40 : x
  2. Step 2: Convert to fraction form
    520,071.20/780,106.80 = 379,066.40/x
  3. Step 3: Cross multiply
    520,071.20x = 780,106.80 × 379,066.40
  4. Step 4: Simplify right side
    520,071.20x = 295,712,276,291.52
  5. Step 5: Solve for x
    x = 295,712,276,291.52/520,071.20
  6. Step 6: Final answer
    x = 568,599.60

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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.