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Finding the Fourth Proportional to 388,155.60, 535,616.64 and 218,386.08

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Solution

The fourth proportional to 388,155.60, 535,616.64 and 218,386.08 is: 301,351.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,155.60 : 535,616.64 = 218,386.08 : x
  2. Step 2: Convert to fraction form
    388,155.60/535,616.64 = 218,386.08/x
  3. Step 3: Cross multiply
    388,155.60x = 535,616.64 × 218,386.08
  4. Step 4: Simplify right side
    388,155.60x = 116,971,218,392.37
  5. Step 5: Solve for x
    x = 116,971,218,392.37/388,155.60
  6. Step 6: Final answer
    x = 301,351.36

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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.