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Finding the Fourth Proportional to 528,728.64, 729,646.44 and 287,011.38

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Solution

The fourth proportional to 528,728.64, 729,646.44 and 287,011.38 is: 396,076.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    528,728.64 : 729,646.44 = 287,011.38 : x
  2. Step 2: Convert to fraction form
    528,728.64/729,646.44 = 287,011.38/x
  3. Step 3: Cross multiply
    528,728.64x = 729,646.44 × 287,011.38
  4. Step 4: Simplify right side
    528,728.64x = 209,416,831,656.49
  5. Step 5: Solve for x
    x = 209,416,831,656.49/528,728.64
  6. Step 6: Final answer
    x = 396,076.20

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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.