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Finding the Fourth Proportional to 1,395,985.70, 2,093,978.55 and 917,688.80

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Solution

The fourth proportional to 1,395,985.70, 2,093,978.55 and 917,688.80 is: 1,376,533.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,395,985.70 : 2,093,978.55 = 917,688.80 : x
  2. Step 2: Convert to fraction form
    1,395,985.70/2,093,978.55 = 917,688.80/x
  3. Step 3: Cross multiply
    1,395,985.70x = 2,093,978.55 × 917,688.80
  4. Step 4: Simplify right side
    1,395,985.70x = 1,921,620,662,775.24
  5. Step 5: Solve for x
    x = 1,921,620,662,775.24/1,395,985.70
  6. Step 6: Final answer
    x = 1,376,533.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.