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Finding the Fourth Proportional to 390,425.22, 538,783.02 and 218,341.26

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Solution

The fourth proportional to 390,425.22, 538,783.02 and 218,341.26 is: 301,308.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,425.22 : 538,783.02 = 218,341.26 : x
  2. Step 2: Convert to fraction form
    390,425.22/538,783.02 = 218,341.26/x
  3. Step 3: Cross multiply
    390,425.22x = 538,783.02 × 218,341.26
  4. Step 4: Simplify right side
    390,425.22x = 117,638,563,453.41
  5. Step 5: Solve for x
    x = 117,638,563,453.41/390,425.22
  6. Step 6: Final answer
    x = 301,308.82

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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.