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Finding the Fourth Proportional to 390,303.30, 538,611.54 and 220,533.78

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Solution

The fourth proportional to 390,303.30, 538,611.54 and 220,533.78 is: 304,332.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,303.30 : 538,611.54 = 220,533.78 : x
  2. Step 2: Convert to fraction form
    390,303.30/538,611.54 = 220,533.78/x
  3. Step 3: Cross multiply
    390,303.30x = 538,611.54 × 220,533.78
  4. Step 4: Simplify right side
    390,303.30x = 118,782,038,867.82
  5. Step 5: Solve for x
    x = 118,782,038,867.82/390,303.30
  6. Step 6: Final answer
    x = 304,332.65

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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.