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Finding the Fourth Proportional to 390,212.40, 538,492.40 and 211,364.40

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Solution

The fourth proportional to 390,212.40, 538,492.40 and 211,364.40 is: 291,682.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,212.40 : 538,492.40 = 211,364.40 : x
  2. Step 2: Convert to fraction form
    390,212.40/538,492.40 = 211,364.40/x
  3. Step 3: Cross multiply
    390,212.40x = 538,492.40 × 211,364.40
  4. Step 4: Simplify right side
    390,212.40x = 113,818,123,030.56
  5. Step 5: Solve for x
    x = 113,818,123,030.56/390,212.40
  6. Step 6: Final answer
    x = 291,682.49

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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.