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Finding the Fourth Proportional to 659,888.63, 910,636.58 and 387,987.11

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Solution

The fourth proportional to 659,888.63, 910,636.58 and 387,987.11 is: 535,416.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,888.63 : 910,636.58 = 387,987.11 : x
  2. Step 2: Convert to fraction form
    659,888.63/910,636.58 = 387,987.11/x
  3. Step 3: Cross multiply
    659,888.63x = 910,636.58 × 387,987.11
  4. Step 4: Simplify right side
    659,888.63x = 353,315,248,441.37
  5. Step 5: Solve for x
    x = 353,315,248,441.37/659,888.63
  6. Step 6: Final answer
    x = 535,416.49

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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.