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Finding the Fourth Proportional to 390,503.90, 538,888.25 and 220,738.03

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Solution

The fourth proportional to 390,503.90, 538,888.25 and 220,738.03 is: 304,614.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,503.90 : 538,888.25 = 220,738.03 : x
  2. Step 2: Convert to fraction form
    390,503.90/538,888.25 = 220,738.03/x
  3. Step 3: Cross multiply
    390,503.90x = 538,888.25 × 220,738.03
  4. Step 4: Simplify right side
    390,503.90x = 118,953,129,899.77
  5. Step 5: Solve for x
    x = 118,953,129,899.77/390,503.90
  6. Step 6: Final answer
    x = 304,614.45

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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.