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Finding the Fourth Proportional to 651,908.20, 978,438.30 and 385,335.40

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Solution

The fourth proportional to 651,908.20, 978,438.30 and 385,335.40 is: 578,343.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    651,908.20 : 978,438.30 = 385,335.40 : x
  2. Step 2: Convert to fraction form
    651,908.20/978,438.30 = 385,335.40/x
  3. Step 3: Cross multiply
    651,908.20x = 978,438.30 × 385,335.40
  4. Step 4: Simplify right side
    651,908.20x = 377,026,913,705.82
  5. Step 5: Solve for x
    x = 377,026,913,705.82/651,908.20
  6. Step 6: Final answer
    x = 578,343.57

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.