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Finding the Fourth Proportional to 390,725.54, 539,223.84 and 218,642.00

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Solution

The fourth proportional to 390,725.54, 539,223.84 and 218,642.00 is: 301,738.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,725.54 : 539,223.84 = 218,642.00 : x
  2. Step 2: Convert to fraction form
    390,725.54/539,223.84 = 218,642.00/x
  3. Step 3: Cross multiply
    390,725.54x = 539,223.84 × 218,642.00
  4. Step 4: Simplify right side
    390,725.54x = 117,896,975,309.25
  5. Step 5: Solve for x
    x = 117,896,975,309.25/390,725.54
  6. Step 6: Final answer
    x = 301,738.60

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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.