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Finding the Fourth Proportional to 528,783.19, 729,016.10 and 420,249.90

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Solution

The fourth proportional to 528,783.19, 729,016.10 and 420,249.90 is: 579,384.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    528,783.19 : 729,016.10 = 420,249.90 : x
  2. Step 2: Convert to fraction form
    528,783.19/729,016.10 = 420,249.90/x
  3. Step 3: Cross multiply
    528,783.19x = 729,016.10 × 420,249.90
  4. Step 4: Simplify right side
    528,783.19x = 306,368,945,331.89
  5. Step 5: Solve for x
    x = 306,368,945,331.89/528,783.19
  6. Step 6: Final answer
    x = 579,384.81

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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.