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Finding the Fourth Proportional to 630,887.45, 870,936.84 and 389,303.06

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Solution

The fourth proportional to 630,887.45, 870,936.84 and 389,303.06 is: 537,430.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    630,887.45 : 870,936.84 = 389,303.06 : x
  2. Step 2: Convert to fraction form
    630,887.45/870,936.84 = 389,303.06/x
  3. Step 3: Cross multiply
    630,887.45x = 870,936.84 × 389,303.06
  4. Step 4: Simplify right side
    630,887.45x = 339,058,372,524.05
  5. Step 5: Solve for x
    x = 339,058,372,524.05/630,887.45
  6. Step 6: Final answer
    x = 537,430.84

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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.