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Finding the Fourth Proportional to 528,855.16, 729,115.10 and 420,321.88

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Solution

The fourth proportional to 528,855.16, 729,115.10 and 420,321.88 is: 579,483.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    528,855.16 : 729,115.10 = 420,321.88 : x
  2. Step 2: Convert to fraction form
    528,855.16/729,115.10 = 420,321.88/x
  3. Step 3: Cross multiply
    528,855.16x = 729,115.10 × 420,321.88
  4. Step 4: Simplify right side
    528,855.16x = 306,463,029,568.39
  5. Step 5: Solve for x
    x = 306,463,029,568.39/528,855.16
  6. Step 6: Final answer
    x = 579,483.86

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.