Home / 1,389,970-1,918,145.64-786,358

Finding the Fourth Proportional to 1,389,970, 1,918,145.64 and 786,358

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Solution

The fourth proportional to 1,389,970, 1,918,145.64 and 786,358 is: 1,085,166.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389,970 : 1,918,145.64 = 786,358 : x
  2. Step 2: Convert to fraction form
    1,389,970/1,918,145.64 = 786,358/x
  3. Step 3: Cross multiply
    1,389,970x = 1,918,145.64 × 786,358
  4. Step 4: Simplify right side
    1,389,970x = 1,508,349,169,179.12
  5. Step 5: Solve for x
    x = 1,508,349,169,179.12/1,389,970
  6. Step 6: Final answer
    x = 1,085,166.71

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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.