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Finding the Fourth Proportional to 664,703.60, 917,300.04 and 378,225.20

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Solution

The fourth proportional to 664,703.60, 917,300.04 and 378,225.20 is: 521,955.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,703.60 : 917,300.04 = 378,225.20 : x
  2. Step 2: Convert to fraction form
    664,703.60/917,300.04 = 378,225.20/x
  3. Step 3: Cross multiply
    664,703.60x = 917,300.04 × 378,225.20
  4. Step 4: Simplify right side
    664,703.60x = 346,945,991,089.01
  5. Step 5: Solve for x
    x = 346,945,991,089.01/664,703.60
  6. Step 6: Final answer
    x = 521,955.94

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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.