Home / 390,831,113.89-586,265,525.57-128,509,857.23

Finding the Fourth Proportional to 390,831,113.89, 586,265,525.57 and 128,509,857.23

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Solution

The fourth proportional to 390,831,113.89, 586,265,525.57 and 128,509,857.23 is: 192,770,985.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,831,113.89 : 586,265,525.57 = 128,509,857.23 : x
  2. Step 2: Convert to fraction form
    390,831,113.89/586,265,525.57 = 128,509,857.23/x
  3. Step 3: Cross multiply
    390,831,113.89x = 586,265,525.57 × 128,509,857.23
  4. Step 4: Simplify right side
    390,831,113.89x = 75,340,898,989,871,616
  5. Step 5: Solve for x
    x = 75,340,898,989,871,616/390,831,113.89
  6. Step 6: Final answer
    x = 192,770,985.50

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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.