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Finding the Fourth Proportional to 390,384.96, 538,726.76 and 211,536.96

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Solution

The fourth proportional to 390,384.96, 538,726.76 and 211,536.96 is: 291,918.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,384.96 : 538,726.76 = 211,536.96 : x
  2. Step 2: Convert to fraction form
    390,384.96/538,726.76 = 211,536.96/x
  3. Step 3: Cross multiply
    390,384.96x = 538,726.76 × 211,536.96
  4. Step 4: Simplify right side
    390,384.96x = 113,960,621,081.05
  5. Step 5: Solve for x
    x = 113,960,621,081.05/390,384.96
  6. Step 6: Final answer
    x = 291,918.57

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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.