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Finding the Fourth Proportional to 666,415.08, 919,360.69 and 390,633.12

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Solution

The fourth proportional to 666,415.08, 919,360.69 and 390,633.12 is: 538,902.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,415.08 : 919,360.69 = 390,633.12 : x
  2. Step 2: Convert to fraction form
    666,415.08/919,360.69 = 390,633.12/x
  3. Step 3: Cross multiply
    666,415.08x = 919,360.69 × 390,633.12
  4. Step 4: Simplify right side
    666,415.08x = 359,132,734,740.05
  5. Step 5: Solve for x
    x = 359,132,734,740.05/666,415.08
  6. Step 6: Final answer
    x = 538,902.47

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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.