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Finding the Fourth Proportional to 380,489.78, 525,030.90 and 219,397.76

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Solution

The fourth proportional to 380,489.78, 525,030.90 and 219,397.76 is: 302,742.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    380,489.78 : 525,030.90 = 219,397.76 : x
  2. Step 2: Convert to fraction form
    380,489.78/525,030.90 = 219,397.76/x
  3. Step 3: Cross multiply
    380,489.78x = 525,030.90 × 219,397.76
  4. Step 4: Simplify right side
    380,489.78x = 115,190,603,390.78
  5. Step 5: Solve for x
    x = 115,190,603,390.78/380,489.78
  6. Step 6: Final answer
    x = 302,742.96

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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.