Home / 1,390,615,979.40-2,085,923,969.10-421,267,595.40

Finding the Fourth Proportional to 1,390,615,979.40, 2,085,923,969.10 and 421,267,595.40

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Solution

The fourth proportional to 1,390,615,979.40, 2,085,923,969.10 and 421,267,595.40 is: 631,901,393.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390,615,979.40 : 2,085,923,969.10 = 421,267,595.40 : x
  2. Step 2: Convert to fraction form
    1,390,615,979.40/2,085,923,969.10 = 421,267,595.40/x
  3. Step 3: Cross multiply
    1,390,615,979.40x = 2,085,923,969.10 × 421,267,595.40
  4. Step 4: Simplify right side
    1,390,615,979.40x = 878,732,174,649,980,800
  5. Step 5: Solve for x
    x = 878,732,174,649,980,800/1,390,615,979.40
  6. Step 6: Final answer
    x = 631,901,393.10

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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.