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Finding the Fourth Proportional to 387,415.71, 534,607.74 and 215,322.51

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Solution

The fourth proportional to 387,415.71, 534,607.74 and 215,322.51 is: 297,130.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,415.71 : 534,607.74 = 215,322.51 : x
  2. Step 2: Convert to fraction form
    387,415.71/534,607.74 = 215,322.51/x
  3. Step 3: Cross multiply
    387,415.71x = 534,607.74 × 215,322.51
  4. Step 4: Simplify right side
    387,415.71x = 115,113,080,442.23
  5. Step 5: Solve for x
    x = 115,113,080,442.23/387,415.71
  6. Step 6: Final answer
    x = 297,130.65

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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.