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Finding the Fourth Proportional to 677,420.36, 934,839 and 390,940.40

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Solution

The fourth proportional to 677,420.36, 934,839 and 390,940.40 is: 539,497.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    677,420.36 : 934,839 = 390,940.40 : x
  2. Step 2: Convert to fraction form
    677,420.36/934,839 = 390,940.40/x
  3. Step 3: Cross multiply
    677,420.36x = 934,839 × 390,940.40
  4. Step 4: Simplify right side
    677,420.36x = 365,466,332,595.60
  5. Step 5: Solve for x
    x = 365,466,332,595.60/677,420.36
  6. Step 6: Final answer
    x = 539,497.12

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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.