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Finding the Fourth Proportional to 1,289,892.96, 1,779,975.60 and 716,913.36

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Solution

The fourth proportional to 1,289,892.96, 1,779,975.60 and 716,913.36 is: 989,297.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289,892.96 : 1,779,975.60 = 716,913.36 : x
  2. Step 2: Convert to fraction form
    1,289,892.96/1,779,975.60 = 716,913.36/x
  3. Step 3: Cross multiply
    1,289,892.96x = 1,779,975.60 × 716,913.36
  4. Step 4: Simplify right side
    1,289,892.96x = 1,276,088,288,114.02
  5. Step 5: Solve for x
    x = 1,276,088,288,114.02/1,289,892.96
  6. Step 6: Final answer
    x = 989,297.82

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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.