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Finding the Fourth Proportional to 390,037.52, 538,249.10 and 217,955.92

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Solution

The fourth proportional to 390,037.52, 538,249.10 and 217,955.92 is: 300,777.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,037.52 : 538,249.10 = 217,955.92 : x
  2. Step 2: Convert to fraction form
    390,037.52/538,249.10 = 217,955.92/x
  3. Step 3: Cross multiply
    390,037.52x = 538,249.10 × 217,955.92
  4. Step 4: Simplify right side
    390,037.52x = 117,314,575,344.27
  5. Step 5: Solve for x
    x = 117,314,575,344.27/390,037.52
  6. Step 6: Final answer
    x = 300,777.67

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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.