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Finding the Fourth Proportional to 390,849, 586,124.05 and 213,261.09

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Solution

The fourth proportional to 390,849, 586,124.05 and 213,261.09 is: 319,810.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,849 : 586,124.05 = 213,261.09 : x
  2. Step 2: Convert to fraction form
    390,849/586,124.05 = 213,261.09/x
  3. Step 3: Cross multiply
    390,849x = 586,124.05 × 213,261.09
  4. Step 4: Simplify right side
    390,849x = 124,997,453,778.22
  5. Step 5: Solve for x
    x = 124,997,453,778.22/390,849
  6. Step 6: Final answer
    x = 319,810.09

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1.5x scale

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.