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Finding the Fourth Proportional to 666,916.46, 920,258.90 and 380,419.46

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Solution

The fourth proportional to 666,916.46, 920,258.90 and 380,419.46 is: 524,929.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,916.46 : 920,258.90 = 380,419.46 : x
  2. Step 2: Convert to fraction form
    666,916.46/920,258.90 = 380,419.46/x
  3. Step 3: Cross multiply
    666,916.46x = 920,258.90 × 380,419.46
  4. Step 4: Simplify right side
    666,916.46x = 350,084,393,798.19
  5. Step 5: Solve for x
    x = 350,084,393,798.19/666,916.46
  6. Step 6: Final answer
    x = 524,929.90

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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.