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Finding the Fourth Proportional to 390,055.50, 538,276.59 and 211,207.50

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Solution

The fourth proportional to 390,055.50, 538,276.59 and 211,207.50 is: 291,466.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,055.50 : 538,276.59 = 211,207.50 : x
  2. Step 2: Convert to fraction form
    390,055.50/538,276.59 = 211,207.50/x
  3. Step 3: Cross multiply
    390,055.50x = 538,276.59 × 211,207.50
  4. Step 4: Simplify right side
    390,055.50x = 113,688,052,882.43
  5. Step 5: Solve for x
    x = 113,688,052,882.43/390,055.50
  6. Step 6: Final answer
    x = 291,466.35

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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.