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Finding the Fourth Proportional to 390,097.77, 538,330.72 and 215,667.23

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Solution

The fourth proportional to 390,097.77, 538,330.72 and 215,667.23 is: 297,618.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,097.77 : 538,330.72 = 215,667.23 : x
  2. Step 2: Convert to fraction form
    390,097.77/538,330.72 = 215,667.23/x
  3. Step 3: Cross multiply
    390,097.77x = 538,330.72 × 215,667.23
  4. Step 4: Simplify right side
    390,097.77x = 116,100,296,315.46
  5. Step 5: Solve for x
    x = 116,100,296,315.46/390,097.77
  6. Step 6: Final answer
    x = 297,618.46

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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.