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Finding the Fourth Proportional to 390,391.23, 538,736.19 and 218,307.23

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Solution

The fourth proportional to 390,391.23, 538,736.19 and 218,307.23 is: 301,261.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,391.23 : 538,736.19 = 218,307.23 : x
  2. Step 2: Convert to fraction form
    390,391.23/538,736.19 = 218,307.23/x
  3. Step 3: Cross multiply
    390,391.23x = 538,736.19 × 218,307.23
  4. Step 4: Simplify right side
    390,391.23x = 117,610,003,847.58
  5. Step 5: Solve for x
    x = 117,610,003,847.58/390,391.23
  6. Step 6: Final answer
    x = 301,261.90

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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.