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Finding the Fourth Proportional to 388,054.52, 535,509.90 and 215,972.45

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Solution

The fourth proportional to 388,054.52, 535,509.90 and 215,972.45 is: 298,039.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,054.52 : 535,509.90 = 215,972.45 : x
  2. Step 2: Convert to fraction form
    388,054.52/535,509.90 = 215,972.45/x
  3. Step 3: Cross multiply
    388,054.52x = 535,509.90 × 215,972.45
  4. Step 4: Simplify right side
    388,054.52x = 115,655,382,424.71
  5. Step 5: Solve for x
    x = 115,655,382,424.71/388,054.52
  6. Step 6: Final answer
    x = 298,039.01

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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.