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Finding the Fourth Proportional to 390,720.34, 539,039.91 and 245,440.77

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Solution

The fourth proportional to 390,720.34, 539,039.91 and 245,440.77 is: 338,611.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,720.34 : 539,039.91 = 245,440.77 : x
  2. Step 2: Convert to fraction form
    390,720.34/539,039.91 = 245,440.77/x
  3. Step 3: Cross multiply
    390,720.34x = 539,039.91 × 245,440.77
  4. Step 4: Simplify right side
    390,720.34x = 132,302,370,571.13
  5. Step 5: Solve for x
    x = 132,302,370,571.13/390,720.34
  6. Step 6: Final answer
    x = 338,611.42

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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.