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Finding the Fourth Proportional to 660,688.17, 911,734.40 and 385,028.48

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Solution

The fourth proportional to 660,688.17, 911,734.40 and 385,028.48 is: 531,330.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,688.17 : 911,734.40 = 385,028.48 : x
  2. Step 2: Convert to fraction form
    660,688.17/911,734.40 = 385,028.48/x
  3. Step 3: Cross multiply
    660,688.17x = 911,734.40 × 385,028.48
  4. Step 4: Simplify right side
    660,688.17x = 351,043,703,711.90
  5. Step 5: Solve for x
    x = 351,043,703,711.90/660,688.17
  6. Step 6: Final answer
    x = 531,330.39

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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.