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Finding the Fourth Proportional to 390,792.96, 539,323.20 and 218,728.26

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Solution

The fourth proportional to 390,792.96, 539,323.20 and 218,728.26 is: 301,861.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,792.96 : 539,323.20 = 218,728.26 : x
  2. Step 2: Convert to fraction form
    390,792.96/539,323.20 = 218,728.26/x
  3. Step 3: Cross multiply
    390,792.96x = 539,323.20 × 218,728.26
  4. Step 4: Simplify right side
    390,792.96x = 117,965,225,113.63
  5. Step 5: Solve for x
    x = 117,965,225,113.63/390,792.96
  6. Step 6: Final answer
    x = 301,861.18

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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.