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Finding the Fourth Proportional to 520,085.40, 780,128.10 and 520,085.40

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Solution

The fourth proportional to 520,085.40, 780,128.10 and 520,085.40 is: 780,128.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,085.40 : 780,128.10 = 520,085.40 : x
  2. Step 2: Convert to fraction form
    520,085.40/780,128.10 = 520,085.40/x
  3. Step 3: Cross multiply
    520,085.40x = 780,128.10 × 520,085.40
  4. Step 4: Simplify right side
    520,085.40x = 405,733,234,939.74
  5. Step 5: Solve for x
    x = 405,733,234,939.74/520,085.40
  6. Step 6: Final answer
    x = 780,128.10

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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.