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Finding the Fourth Proportional to 621,673.92, 858,219.84 and 407,142.72

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Solution

The fourth proportional to 621,673.92, 858,219.84 and 407,142.72 is: 562,059.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,673.92 : 858,219.84 = 407,142.72 : x
  2. Step 2: Convert to fraction form
    621,673.92/858,219.84 = 407,142.72/x
  3. Step 3: Cross multiply
    621,673.92x = 858,219.84 × 407,142.72
  4. Step 4: Simplify right side
    621,673.92x = 349,417,960,015.57
  5. Step 5: Solve for x
    x = 349,417,960,015.57/621,673.92
  6. Step 6: Final answer
    x = 562,059.87

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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.