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Finding the Fourth Proportional to 455,357.68, 628,390.64 and 251,421.28

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Solution

The fourth proportional to 455,357.68, 628,390.64 and 251,421.28 is: 346,959.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    455,357.68 : 628,390.64 = 251,421.28 : x
  2. Step 2: Convert to fraction form
    455,357.68/628,390.64 = 251,421.28/x
  3. Step 3: Cross multiply
    455,357.68x = 628,390.64 × 251,421.28
  4. Step 4: Simplify right side
    455,357.68x = 157,990,779,048.82
  5. Step 5: Solve for x
    x = 157,990,779,048.82/455,357.68
  6. Step 6: Final answer
    x = 346,959.73

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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.