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Finding the Fourth Proportional to 520,752, 781,128.16 and 126,768

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Solution

The fourth proportional to 520,752, 781,128.16 and 126,768 is: 190,152.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,752 : 781,128.16 = 126,768 : x
  2. Step 2: Convert to fraction form
    520,752/781,128.16 = 126,768/x
  3. Step 3: Cross multiply
    520,752x = 781,128.16 × 126,768
  4. Step 4: Simplify right side
    520,752x = 99,022,054,586.88
  5. Step 5: Solve for x
    x = 99,022,054,586.88/520,752
  6. Step 6: Final answer
    x = 190,152.04

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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.